diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000..52591e4
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,6 @@
+[settings]
+known_first_party=sqlalchemy_utils,tests
+line_length=79
+multi_line_output=3
+not_skip=__init__.py
+order_by_type=false
diff --git a/.travis.yml b/.travis.yml
index c665e30..a307723 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,5 +33,6 @@ install:
   - pip install -e .[$EXTRAS]
 
 script:
+  - isort --recursive --diff sqlalchemy_utils tests && isort --recursive --check-only sqlalchemy_utils tests
   - flake8 sqlalchemy_utils tests
   - py.test
diff --git a/setup.py b/setup.py
index 1c7112e..02d8a52 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,8 @@ extras_require = {
         'pytz>=2014.2',
         'python-dateutil>=2.2',
         'pymysql',
-        'flake8>=2.4.0'
+        'flake8>=2.4.0',
+        'isort==3.9.6'
     ],
     'anyjson': ['anyjson>=0.3.3'],
     'babel': ['Babel>=1.3'],
diff --git a/sqlalchemy_utils/__init__.py b/sqlalchemy_utils/__init__.py
index f6f5e3d..5101395 100644
--- a/sqlalchemy_utils/__init__.py
+++ b/sqlalchemy_utils/__init__.py
@@ -1,10 +1,10 @@
 from .aggregates import aggregated  # noqa
 from .asserts import (  # noqa
-    assert_min_value,
     assert_max_length,
     assert_max_value,
-    assert_nullable,
-    assert_non_nullable
+    assert_min_value,
+    assert_non_nullable,
+    assert_nullable
 )
 from .batch import batch_fetch, with_backrefs  # noqa
 from .decorators import generates  # noqa
@@ -25,8 +25,8 @@ from .functions import (  # noqa
     get_declarative_base,
     get_hybrid_properties,
     get_mapper,
-    get_query_entities,
     get_primary_keys,
+    get_query_entities,
     get_referencing_foreign_keys,
     get_tables,
     group_foreign_keys,
@@ -42,8 +42,9 @@ from .functions import (  # noqa
     render_expression,
     render_statement,
     sort_query,
-    table_name,
+    table_name
 )
+from .generic import generic_relationship  # noqa
 from .i18n import TranslationHybrid  # noqa
 from .listeners import (  # noqa
     auto_delete_orphans,
@@ -51,9 +52,9 @@ from .listeners import (  # noqa
     force_auto_coercion,
     force_instant_defaults
 )
-from .generic import generic_relationship  # noqa
-from .proxy_dict import ProxyDict, proxy_dict  # noqa
+from .models import Timestamp  # noqa
 from .observer import observes  # noqa
+from .proxy_dict import proxy_dict, ProxyDict  # noqa
 from .query_chain import QueryChain  # noqa
 from .types import (  # noqa
     ArrowType,
@@ -85,7 +86,5 @@ from .types import (  # noqa
     UUIDType,
     WeekDaysType
 )
-from .models import Timestamp  # noqa
-
 
 __version__ = '0.29.8'
diff --git a/sqlalchemy_utils/aggregates.py b/sqlalchemy_utils/aggregates.py
index ee4a5a0..c02b1f2 100644
--- a/sqlalchemy_utils/aggregates.py
+++ b/sqlalchemy_utils/aggregates.py
@@ -365,9 +365,13 @@ TODO
 from collections import defaultdict
 from weakref import WeakKeyDictionary
 
-import sqlalchemy as sa
 import six
+import sqlalchemy as sa
 from sqlalchemy.ext.declarative import declared_attr
+
+from .functions.orm import get_column_key
+from .relationships import chained_join, select_aggregate
+
 try:
     # SQLAlchemy 0.9
     from sqlalchemy.sql.functions import _FunctionGenerator
@@ -375,9 +379,6 @@ except ImportError:
     # SQLAlchemy 0.8
     from sqlalchemy.sql.expression import _FunctionGenerator
 
-from .functions.orm import get_column_key
-from .relationships import chained_join, select_aggregate
-
 
 aggregated_attrs = WeakKeyDictionary(defaultdict(list))
 
diff --git a/sqlalchemy_utils/asserts.py b/sqlalchemy_utils/asserts.py
index 507c8e6..a7f5ee9 100644
--- a/sqlalchemy_utils/asserts.py
+++ b/sqlalchemy_utils/asserts.py
@@ -33,6 +33,7 @@ We can easily test the constraints by assert_* functions::
     assert_max_length(user, 'email', 300)
 """
 from decimal import Decimal
+
 import sqlalchemy as sa
 from sqlalchemy.dialects.postgresql import ARRAY
 from sqlalchemy.exc import DataError, IntegrityError
diff --git a/sqlalchemy_utils/batch.py b/sqlalchemy_utils/batch.py
index 8aa97dd..5796dd4 100644
--- a/sqlalchemy_utils/batch.py
+++ b/sqlalchemy_utils/batch.py
@@ -1,21 +1,24 @@
 from collections import defaultdict
 from itertools import chain
+
 import six
 import sqlalchemy as sa
 from sqlalchemy.orm import RelationshipProperty
 from sqlalchemy.orm.attributes import (
-    set_committed_value, InstrumentedAttribute
+    InstrumentedAttribute,
+    set_committed_value
 )
 from sqlalchemy.orm.session import object_session
-from sqlalchemy_utils.generic import GenericRelationshipProperty
+
 from sqlalchemy_utils.functions.orm import (
-    list_local_values,
     list_local_remote_exprs,
+    list_local_values,
     local_values,
+    remote,
     remote_column_names,
-    remote_values,
-    remote
+    remote_values
 )
+from sqlalchemy_utils.generic import GenericRelationshipProperty
 
 
 class PathException(Exception):
diff --git a/sqlalchemy_utils/decorators.py b/sqlalchemy_utils/decorators.py
index 64e00ab..342a202 100644
--- a/sqlalchemy_utils/decorators.py
+++ b/sqlalchemy_utils/decorators.py
@@ -1,7 +1,9 @@
-from collections import defaultdict
 import itertools
-import sqlalchemy as sa
+from collections import defaultdict
+
 import six
+import sqlalchemy as sa
+
 from .functions import getdotattr
 
 
diff --git a/sqlalchemy_utils/expression_parser.py b/sqlalchemy_utils/expression_parser.py
index 5bac9d3..074cc61 100644
--- a/sqlalchemy_utils/expression_parser.py
+++ b/sqlalchemy_utils/expression_parser.py
@@ -7,22 +7,22 @@ import six
 import sqlalchemy as sa
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 from sqlalchemy.sql.annotation import AnnotatedColumn
-from sqlalchemy.sql.expression import (
-    BooleanClauseList,
-    BinaryExpression,
-    UnaryExpression,
-    BindParameter,
-    Cast,
-)
 from sqlalchemy.sql.elements import (
-    False_,
-    True_,
-    Grouping,
-    ClauseList,
-    Label,
     Case,
-    Tuple,
-    Null
+    ClauseList,
+    False_,
+    Grouping,
+    Label,
+    Null,
+    True_,
+    Tuple
+)
+from sqlalchemy.sql.expression import (
+    BinaryExpression,
+    BindParameter,
+    BooleanClauseList,
+    Cast,
+    UnaryExpression
 )
 
 
diff --git a/sqlalchemy_utils/expressions.py b/sqlalchemy_utils/expressions.py
index 9eadac4..8ac1a1d 100644
--- a/sqlalchemy_utils/expressions.py
+++ b/sqlalchemy_utils/expressions.py
@@ -1,11 +1,11 @@
 import sqlalchemy as sa
+from sqlalchemy.ext.compiler import compiles
 from sqlalchemy.sql import expression
 from sqlalchemy.sql.expression import (
-    Executable,
+    _literal_as_text,
     ClauseElement,
-    _literal_as_text
+    Executable
 )
-from sqlalchemy.ext.compiler import compiles
 
 
 class explain(Executable, ClauseElement):
diff --git a/sqlalchemy_utils/functions/__init__.py b/sqlalchemy_utils/functions/__init__.py
index edc6270..a02df98 100644
--- a/sqlalchemy_utils/functions/__init__.py
+++ b/sqlalchemy_utils/functions/__init__.py
@@ -1,10 +1,3 @@
-from .mock import create_mock_engine, mock_engine  # noqa
-from .render import render_expression, render_statement  # noqa
-from .sort_query import (  # noqa
-    make_order_by_deterministic,
-    sort_query,
-    QuerySorterException
-)
 from .database import (  # noqa
     analyze,
     create_database,
@@ -22,8 +15,9 @@ from .foreign_keys import (  # noqa
     group_foreign_keys,
     is_indexed_foreign_key,
     merge_references,
-    non_indexed_foreign_keys,
+    non_indexed_foreign_keys
 )
+from .mock import create_mock_engine, mock_engine  # noqa
 from .orm import (  # noqa
     get_bind,
     get_class_by_table,
@@ -41,5 +35,11 @@ from .orm import (  # noqa
     is_loaded,
     naturally_equivalent,
     quote,
-    table_name,
+    table_name
+)
+from .render import render_expression, render_statement  # noqa
+from .sort_query import (  # noqa
+    make_order_by_deterministic,
+    QuerySorterException,
+    sort_query
 )
diff --git a/sqlalchemy_utils/functions/database.py b/sqlalchemy_utils/functions/database.py
index b89442b..3e7b034 100644
--- a/sqlalchemy_utils/functions/database.py
+++ b/sqlalchemy_utils/functions/database.py
@@ -5,7 +5,8 @@ from copy import copy
 
 import sqlalchemy as sa
 from sqlalchemy.engine.url import make_url
-from sqlalchemy.exc import ProgrammingError, OperationalError
+from sqlalchemy.exc import OperationalError, ProgrammingError
+
 from sqlalchemy_utils.expressions import explain_analyze
 
 from .orm import quote
diff --git a/sqlalchemy_utils/functions/foreign_keys.py b/sqlalchemy_utils/functions/foreign_keys.py
index 9157580..c9a0ef2 100644
--- a/sqlalchemy_utils/functions/foreign_keys.py
+++ b/sqlalchemy_utils/functions/foreign_keys.py
@@ -5,10 +5,10 @@ import six
 import sqlalchemy as sa
 from sqlalchemy.exc import NoInspectionAvailable
 from sqlalchemy.orm import object_session
-from sqlalchemy.schema import MetaData, Table, ForeignKeyConstraint
+from sqlalchemy.schema import ForeignKeyConstraint, MetaData, Table
 
-from .orm import get_column_key, get_mapper, get_tables
 from ..query_chain import QueryChain
+from .orm import get_column_key, get_mapper, get_tables
 
 
 def get_foreign_key_values(fk, obj):
diff --git a/sqlalchemy_utils/functions/mock.py b/sqlalchemy_utils/functions/mock.py
index 812a42c..258e4da 100644
--- a/sqlalchemy_utils/functions/mock.py
+++ b/sqlalchemy_utils/functions/mock.py
@@ -2,6 +2,7 @@ import contextlib
 import datetime
 import inspect
 import re
+
 import six
 import sqlalchemy as sa
 
diff --git a/sqlalchemy_utils/functions/orm.py b/sqlalchemy_utils/functions/orm.py
index 5525fb3..113972e 100644
--- a/sqlalchemy_utils/functions/orm.py
+++ b/sqlalchemy_utils/functions/orm.py
@@ -2,10 +2,12 @@ try:
     from collections import OrderedDict
 except ImportError:
     from ordereddict import OrderedDict
+
 from functools import partial
 from inspect import isclass
 from itertools import chain
 from operator import attrgetter
+
 import six
 import sqlalchemy as sa
 from sqlalchemy.ext.hybrid import hybrid_property
@@ -16,6 +18,7 @@ from sqlalchemy.orm.properties import ColumnProperty
 from sqlalchemy.orm.query import _ColumnEntity
 from sqlalchemy.orm.session import object_session
 from sqlalchemy.orm.util import AliasedInsp
+
 from sqlalchemy_utils.utils import is_sequence
 
 
diff --git a/sqlalchemy_utils/functions/render.py b/sqlalchemy_utils/functions/render.py
index 44010c5..bf3be1e 100644
--- a/sqlalchemy_utils/functions/render.py
+++ b/sqlalchemy_utils/functions/render.py
@@ -1,6 +1,8 @@
 import inspect
+
 import six
 import sqlalchemy as sa
+
 from .mock import create_mock_engine
 
 
diff --git a/sqlalchemy_utils/functions/sort_query.py b/sqlalchemy_utils/functions/sort_query.py
index 81688af..f233c4f 100644
--- a/sqlalchemy_utils/functions/sort_query.py
+++ b/sqlalchemy_utils/functions/sort_query.py
@@ -1,5 +1,5 @@
 import sqlalchemy as sa
-from sqlalchemy.sql.expression import desc, asc
+from sqlalchemy.sql.expression import asc, desc
 
 from .database import has_unique_index
 from .orm import get_query_descriptor, get_tables
diff --git a/sqlalchemy_utils/generic.py b/sqlalchemy_utils/generic.py
index 1360a35..d117e0c 100644
--- a/sqlalchemy_utils/generic.py
+++ b/sqlalchemy_utils/generic.py
@@ -3,11 +3,11 @@ from collections import Iterable
 import six
 import sqlalchemy as sa
 from sqlalchemy.ext.hybrid import hybrid_property
-from sqlalchemy.orm import attributes, class_mapper
-from sqlalchemy.orm import ColumnProperty
+from sqlalchemy.orm import attributes, class_mapper, ColumnProperty
 from sqlalchemy.orm.interfaces import MapperProperty, PropComparator
 from sqlalchemy.orm.session import _state_session
 from sqlalchemy.util import set_creation_order
+
 from sqlalchemy_utils.functions import identity
 
 from .exceptions import ImproperlyConfigured
diff --git a/sqlalchemy_utils/i18n.py b/sqlalchemy_utils/i18n.py
index 129f86b..daa414a 100644
--- a/sqlalchemy_utils/i18n.py
+++ b/sqlalchemy_utils/i18n.py
@@ -2,7 +2,6 @@ from sqlalchemy.ext.hybrid import hybrid_property
 
 from .exceptions import ImproperlyConfigured
 
-
 try:
     from babel.dates import get_day_names
 except ImportError:
@@ -13,7 +12,6 @@ except ImportError:
             'module.'
         )
 
-
 try:
     from flask.ext.babel import get_locale
 except ImportError:
diff --git a/sqlalchemy_utils/listeners.py b/sqlalchemy_utils/listeners.py
index 29970ff..ce6d774 100644
--- a/sqlalchemy_utils/listeners.py
+++ b/sqlalchemy_utils/listeners.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from .exceptions import ImproperlyConfigured
 
 
diff --git a/sqlalchemy_utils/models.py b/sqlalchemy_utils/models.py
index c2cdf66..80a85ec 100644
--- a/sqlalchemy_utils/models.py
+++ b/sqlalchemy_utils/models.py
@@ -1,4 +1,5 @@
 from datetime import datetime
+
 import sqlalchemy as sa
 
 
diff --git a/sqlalchemy_utils/observer.py b/sqlalchemy_utils/observer.py
index d5b51ac..c216c8f 100644
--- a/sqlalchemy_utils/observer.py
+++ b/sqlalchemy_utils/observer.py
@@ -149,15 +149,15 @@ Category has many Products.
     catalog.product_count  # 1
 
 """
+import itertools
+from collections import defaultdict, Iterable, namedtuple
+
 import sqlalchemy as sa
 
-from collections import defaultdict, namedtuple, Iterable
-import itertools
 from sqlalchemy_utils.functions import getdotattr
 from sqlalchemy_utils.path import AttrPath
 from sqlalchemy_utils.utils import is_sequence
 
-
 Callback = namedtuple('Callback', ['func', 'path', 'backref', 'fullpath'])
 
 
diff --git a/sqlalchemy_utils/path.py b/sqlalchemy_utils/path.py
index aaa812e..57ec694 100644
--- a/sqlalchemy_utils/path.py
+++ b/sqlalchemy_utils/path.py
@@ -1,6 +1,7 @@
 import sqlalchemy as sa
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 from sqlalchemy.util.langhelpers import symbol
+
 from .utils import str_coercible
 
 
diff --git a/sqlalchemy_utils/primitives/__init__.py b/sqlalchemy_utils/primitives/__init__.py
index c4c401b..6831294 100644
--- a/sqlalchemy_utils/primitives/__init__.py
+++ b/sqlalchemy_utils/primitives/__init__.py
@@ -1,7 +1,6 @@
 from .weekday import WeekDay
 from .weekdays import WeekDays
 
-
 __all__ = (
     WeekDay,
     WeekDays
diff --git a/sqlalchemy_utils/primitives/weekdays.py b/sqlalchemy_utils/primitives/weekdays.py
index 715bc3d..b6aedab 100644
--- a/sqlalchemy_utils/primitives/weekdays.py
+++ b/sqlalchemy_utils/primitives/weekdays.py
@@ -1,6 +1,7 @@
 import six
 
 from sqlalchemy_utils.utils import str_coercible
+
 from .weekday import WeekDay
 
 
diff --git a/sqlalchemy_utils/types/__init__.py b/sqlalchemy_utils/types/__init__.py
index 9e37990..4895582 100644
--- a/sqlalchemy_utils/types/__init__.py
+++ b/sqlalchemy_utils/types/__init__.py
@@ -1,22 +1,24 @@
 from functools import wraps
+
 from sqlalchemy.orm.collections import InstrumentedList as _InstrumentedList
+
 from .arrow import ArrowType
-from .choice import ChoiceType, Choice
+from .choice import Choice, ChoiceType
 from .color import ColorType
-from .country import CountryType, Country
+from .country import Country, CountryType
 from .email import EmailType
 from .encrypted import EncryptedType
 from .ip_address import IPAddressType
 from .json import JSONType
 from .locale import LocaleType
+from .password import Password, PasswordType
+from .phone_number import PhoneNumber, PhoneNumberType
 from .range import (
     DateRangeType,
     DateTimeRangeType,
     IntRangeType,
-    NumericRangeType,
+    NumericRangeType
 )
-from .password import Password, PasswordType
-from .phone_number import PhoneNumber, PhoneNumberType
 from .scalar_list import ScalarListException, ScalarListType
 from .timezone import TimezoneType
 from .ts_vector import TSVectorType
@@ -24,7 +26,6 @@ from .url import URLType
 from .uuid import UUIDType
 from .weekdays import WeekDaysType
 
-
 __all__ = (
     ArrowType,
     Choice,
diff --git a/sqlalchemy_utils/types/arrow.py b/sqlalchemy_utils/types/arrow.py
index 03bc7d1..441368d 100644
--- a/sqlalchemy_utils/types/arrow.py
+++ b/sqlalchemy_utils/types/arrow.py
@@ -1,16 +1,20 @@
 from __future__ import absolute_import
+
 from collections import Iterable
 from datetime import datetime
+
 import six
+from sqlalchemy import types
+
+from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
+from .scalar_coercible import ScalarCoercible
 
 arrow = None
 try:
     import arrow
 except:
     pass
-from sqlalchemy import types
-from sqlalchemy_utils.exceptions import ImproperlyConfigured
-from .scalar_coercible import ScalarCoercible
 
 
 class ArrowType(types.TypeDecorator, ScalarCoercible):
diff --git a/sqlalchemy_utils/types/choice.py b/sqlalchemy_utils/types/choice.py
index e93fb45..89168a3 100644
--- a/sqlalchemy_utils/types/choice.py
+++ b/sqlalchemy_utils/types/choice.py
@@ -1,7 +1,9 @@
-from sqlalchemy import types
 import six
+from sqlalchemy import types
+
 from ..exceptions import ImproperlyConfigured
 from .scalar_coercible import ScalarCoercible
+
 try:
     from enum import Enum
 except ImportError:
diff --git a/sqlalchemy_utils/types/color.py b/sqlalchemy_utils/types/color.py
index dbe743f..7020a8f 100644
--- a/sqlalchemy_utils/types/color.py
+++ b/sqlalchemy_utils/types/color.py
@@ -1,6 +1,8 @@
 import six
 from sqlalchemy import types
+
 from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
 from .scalar_coercible import ScalarCoercible
 
 colour = None
diff --git a/sqlalchemy_utils/types/country.py b/sqlalchemy_utils/types/country.py
index cb689f9..9baeaaa 100644
--- a/sqlalchemy_utils/types/country.py
+++ b/sqlalchemy_utils/types/country.py
@@ -1,8 +1,10 @@
-from sqlalchemy import types
 import six
-from .scalar_coercible import ScalarCoercible
+from sqlalchemy import types
+
 from sqlalchemy_utils import i18n
 
+from .scalar_coercible import ScalarCoercible
+
 
 class Country(object):
     def __init__(self, code_or_country):
diff --git a/sqlalchemy_utils/types/email.py b/sqlalchemy_utils/types/email.py
index 73acda1..59c5b9b 100644
--- a/sqlalchemy_utils/types/email.py
+++ b/sqlalchemy_utils/types/email.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from ..operators import CaseInsensitiveComparator
 
 
diff --git a/sqlalchemy_utils/types/encrypted.py b/sqlalchemy_utils/types/encrypted.py
index 0d28b41..4470334 100644
--- a/sqlalchemy_utils/types/encrypted.py
+++ b/sqlalchemy_utils/types/encrypted.py
@@ -1,9 +1,12 @@
 # -*- coding: utf-8 -*-
 import base64
-import six
 import datetime
-from sqlalchemy.types import TypeDecorator, String, Binary
+
+import six
+from sqlalchemy.types import Binary, String, TypeDecorator
+
 from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
 from .scalar_coercible import ScalarCoercible
 
 cryptography = None
diff --git a/sqlalchemy_utils/types/ip_address.py b/sqlalchemy_utils/types/ip_address.py
index 3c78f5a..ec1c27a 100644
--- a/sqlalchemy_utils/types/ip_address.py
+++ b/sqlalchemy_utils/types/ip_address.py
@@ -1,4 +1,9 @@
 import six
+from sqlalchemy import types
+
+from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
+from .scalar_coercible import ScalarCoercible
 
 ip_address = None
 try:
@@ -10,11 +15,6 @@ except ImportError:
         pass
 
 
-from sqlalchemy import types
-from sqlalchemy_utils.exceptions import ImproperlyConfigured
-from .scalar_coercible import ScalarCoercible
-
-
 class IPAddressType(types.TypeDecorator, ScalarCoercible):
     """
     Changes IPAddress objects to a string representation on the way in and
diff --git a/sqlalchemy_utils/types/json.py b/sqlalchemy_utils/types/json.py
index b2b0a22..06b3ca5 100644
--- a/sqlalchemy_utils/types/json.py
+++ b/sqlalchemy_utils/types/json.py
@@ -1,5 +1,10 @@
 from __future__ import absolute_import
+
+import six
 import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql.base import ischema_names
+
+from ..exceptions import ImproperlyConfigured
 
 json = None
 try:
@@ -7,10 +12,6 @@ try:
 except ImportError:
     import json as json
 
-import six
-from sqlalchemy.dialects.postgresql.base import ischema_names
-from ..exceptions import ImproperlyConfigured
-
 try:
     from sqlalchemy.dialects.postgresql import JSON
     has_postgres_json = True
diff --git a/sqlalchemy_utils/types/locale.py b/sqlalchemy_utils/types/locale.py
index be5c48f..fccc7d2 100644
--- a/sqlalchemy_utils/types/locale.py
+++ b/sqlalchemy_utils/types/locale.py
@@ -1,7 +1,9 @@
-from sqlalchemy import types
 import six
-from .scalar_coercible import ScalarCoercible
+from sqlalchemy import types
+
 from ..exceptions import ImproperlyConfigured
+from .scalar_coercible import ScalarCoercible
+
 babel = None
 try:
     import babel
diff --git a/sqlalchemy_utils/types/password.py b/sqlalchemy_utils/types/password.py
index 0f9d72e..852b3cb 100644
--- a/sqlalchemy_utils/types/password.py
+++ b/sqlalchemy_utils/types/password.py
@@ -1,11 +1,14 @@
-import six
 import weakref
-from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
+import six
 from sqlalchemy import types
-from sqlalchemy.dialects import postgresql, oracle
-from .scalar_coercible import ScalarCoercible
+from sqlalchemy.dialects import oracle, postgresql
 from sqlalchemy.ext.mutable import Mutable
 
+from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
+from .scalar_coercible import ScalarCoercible
+
 passlib = None
 try:
     import passlib
diff --git a/sqlalchemy_utils/types/phone_number.py b/sqlalchemy_utils/types/phone_number.py
index 3dd1409..e03b03a 100644
--- a/sqlalchemy_utils/types/phone_number.py
+++ b/sqlalchemy_utils/types/phone_number.py
@@ -1,13 +1,13 @@
 from sqlalchemy import types
+
 from sqlalchemy_utils.exceptions import ImproperlyConfigured
 from sqlalchemy_utils.utils import str_coercible
-from .scalar_coercible import ScalarCoercible
 
+from .scalar_coercible import ScalarCoercible
 
 try:
     import phonenumbers
     from phonenumbers.phonenumber import PhoneNumber as BasePhoneNumber
-
 except ImportError:
     phonenumbers = None
     BasePhoneNumber = object
diff --git a/sqlalchemy_utils/types/range.py b/sqlalchemy_utils/types/range.py
index a40036a..396353c 100644
--- a/sqlalchemy_utils/types/range.py
+++ b/sqlalchemy_utils/types/range.py
@@ -119,22 +119,25 @@ Membership operators
 .. _intervals: https://github.com/kvesteri/intervals
 """
 from collections import Iterable
+
+import six
+import sqlalchemy as sa
+from sqlalchemy import types
+from sqlalchemy.dialects.postgresql import (
+    DATERANGE,
+    INT4RANGE,
+    NUMRANGE,
+    TSRANGE
+)
+
+from ..exceptions import ImproperlyConfigured
+from .scalar_coercible import ScalarCoercible
+
 intervals = None
 try:
     import intervals
 except ImportError:
     pass
-import six
-import sqlalchemy as sa
-from sqlalchemy.dialects.postgresql import (
-    INT4RANGE,
-    DATERANGE,
-    NUMRANGE,
-    TSRANGE,
-)
-from sqlalchemy import types
-from ..exceptions import ImproperlyConfigured
-from .scalar_coercible import ScalarCoercible
 
 
 class RangeComparator(types.TypeEngine.Comparator):
diff --git a/sqlalchemy_utils/types/timezone.py b/sqlalchemy_utils/types/timezone.py
index c349ea6..730260f 100644
--- a/sqlalchemy_utils/types/timezone.py
+++ b/sqlalchemy_utils/types/timezone.py
@@ -1,6 +1,8 @@
 import six
 from sqlalchemy import types
+
 from sqlalchemy_utils.exceptions import ImproperlyConfigured
+
 from .scalar_coercible import ScalarCoercible
 
 
diff --git a/sqlalchemy_utils/types/url.py b/sqlalchemy_utils/types/url.py
index 68d5042..f74475a 100644
--- a/sqlalchemy_utils/types/url.py
+++ b/sqlalchemy_utils/types/url.py
@@ -5,6 +5,7 @@ except ImportError:
     pass
 import six
 from sqlalchemy import types
+
 from .scalar_coercible import ScalarCoercible
 
 
diff --git a/sqlalchemy_utils/types/uuid.py b/sqlalchemy_utils/types/uuid.py
index 59d29e3..2fc3ad1 100644
--- a/sqlalchemy_utils/types/uuid.py
+++ b/sqlalchemy_utils/types/uuid.py
@@ -1,7 +1,10 @@
 from __future__ import absolute_import
+
 import uuid
+
 from sqlalchemy import types
 from sqlalchemy.dialects import postgresql
+
 from .scalar_coercible import ScalarCoercible
 
 
diff --git a/sqlalchemy_utils/types/weekdays.py b/sqlalchemy_utils/types/weekdays.py
index 6b1d269..efd6232 100644
--- a/sqlalchemy_utils/types/weekdays.py
+++ b/sqlalchemy_utils/types/weekdays.py
@@ -5,10 +5,12 @@ except ImportError:
     pass
 import six
 from sqlalchemy import types
+
 from sqlalchemy_utils.exceptions import ImproperlyConfigured
 from sqlalchemy_utils.primitives import WeekDay, WeekDays
-from .scalar_coercible import ScalarCoercible
+
 from .bit import BitType
+from .scalar_coercible import ScalarCoercible
 
 
 class WeekDaysType(types.TypeDecorator, ScalarCoercible):
diff --git a/tests/__init__.py b/tests/__init__.py
index 0fedbd6..34ce3e8 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,13 +1,16 @@
 import warnings
-import sqlalchemy as sa
 
+import sqlalchemy as sa
 from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
 from sqlalchemy.ext.declarative import declarative_base, synonym_for
 from sqlalchemy.ext.hybrid import hybrid_property
+from sqlalchemy.orm import sessionmaker
 
 from sqlalchemy_utils import (
-    InstrumentedList, coercion_listener, aggregates, i18n
+    aggregates,
+    coercion_listener,
+    i18n,
+    InstrumentedList
 )
 
 
diff --git a/tests/aggregate/test_backrefs.py b/tests/aggregate/test_backrefs.py
index c870444..e7d0d2d 100644
--- a/tests/aggregate/test_backrefs.py
+++ b/tests/aggregate/test_backrefs.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_custom_select_expressions.py b/tests/aggregate/test_custom_select_expressions.py
index 725acca..de03b79 100644
--- a/tests/aggregate/test_custom_select_expressions.py
+++ b/tests/aggregate/test_custom_select_expressions.py
@@ -1,5 +1,7 @@
 from decimal import Decimal
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_join_table_inheritance.py b/tests/aggregate/test_join_table_inheritance.py
index a6e5041..fa891ec 100644
--- a/tests/aggregate/test_join_table_inheritance.py
+++ b/tests/aggregate/test_join_table_inheritance.py
@@ -1,5 +1,7 @@
 from decimal import Decimal
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_m2m.py b/tests/aggregate/test_m2m.py
index a63f02a..4a9ac45 100644
--- a/tests/aggregate/test_m2m.py
+++ b/tests/aggregate/test_m2m.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_multiple_aggregates_per_class.py b/tests/aggregate/test_multiple_aggregates_per_class.py
index aa949b5..ee8b5dc 100644
--- a/tests/aggregate/test_multiple_aggregates_per_class.py
+++ b/tests/aggregate/test_multiple_aggregates_per_class.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_o2m_o2m.py b/tests/aggregate/test_o2m_o2m.py
index b245a0b..9abed54 100644
--- a/tests/aggregate/test_o2m_o2m.py
+++ b/tests/aggregate/test_o2m_o2m.py
@@ -1,5 +1,7 @@
 from decimal import Decimal
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_search_vectors.py b/tests/aggregate/test_search_vectors.py
index 28c72ac..d2a8621 100644
--- a/tests/aggregate/test_search_vectors.py
+++ b/tests/aggregate/test_search_vectors.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import aggregated, TSVectorType
 from tests import TestCase
 
diff --git a/tests/aggregate/test_simple_paths.py b/tests/aggregate/test_simple_paths.py
index 07104a2..1f1c071 100644
--- a/tests/aggregate/test_simple_paths.py
+++ b/tests/aggregate/test_simple_paths.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_with_column_alias.py b/tests/aggregate/test_with_column_alias.py
index 744cbcd..80a87e5 100644
--- a/tests/aggregate/test_with_column_alias.py
+++ b/tests/aggregate/test_with_column_alias.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/aggregate/test_with_ondelete_cascade.py b/tests/aggregate/test_with_ondelete_cascade.py
index 6070d9b..93a26d0 100644
--- a/tests/aggregate/test_with_ondelete_cascade.py
+++ b/tests/aggregate/test_with_ondelete_cascade.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import aggregated
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_compound_fetching.py b/tests/batch_fetch/test_compound_fetching.py
index db24c76..e4a6ff1 100644
--- a/tests/batch_fetch/test_compound_fetching.py
+++ b/tests/batch_fetch/test_compound_fetching.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_deep_relationships.py b/tests/batch_fetch/test_deep_relationships.py
index afd39b4..98cd5be 100644
--- a/tests/batch_fetch/test_deep_relationships.py
+++ b/tests/batch_fetch/test_deep_relationships.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch, with_backrefs
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_generic_relationship.py b/tests/batch_fetch/test_generic_relationship.py
index 0748c2c..e612562 100644
--- a/tests/batch_fetch/test_generic_relationship.py
+++ b/tests/batch_fetch/test_generic_relationship.py
@@ -1,7 +1,9 @@
 from __future__ import unicode_literals
+
 import sqlalchemy as sa
-from tests import TestCase
+
 from sqlalchemy_utils import batch_fetch, generic_relationship
+from tests import TestCase
 
 
 class TestBatchFetchGenericRelationship(TestCase):
diff --git a/tests/batch_fetch/test_join_table_inheritance.py b/tests/batch_fetch/test_join_table_inheritance.py
index a7f66be..362ebe4 100644
--- a/tests/batch_fetch/test_join_table_inheritance.py
+++ b/tests/batch_fetch/test_join_table_inheritance.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_many_to_many_composite_keys.py b/tests/batch_fetch/test_many_to_many_composite_keys.py
index 0d19578..a2306e4 100644
--- a/tests/batch_fetch/test_many_to_many_composite_keys.py
+++ b/tests/batch_fetch/test_many_to_many_composite_keys.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch, with_backrefs
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_many_to_one_relationships.py b/tests/batch_fetch/test_many_to_one_relationships.py
index 4c774a0..578e290 100644
--- a/tests/batch_fetch/test_many_to_one_relationships.py
+++ b/tests/batch_fetch/test_many_to_one_relationships.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_one_to_many_composite_keys.py b/tests/batch_fetch/test_one_to_many_composite_keys.py
index 386f7fa..b19bc71 100644
--- a/tests/batch_fetch/test_one_to_many_composite_keys.py
+++ b/tests/batch_fetch/test_one_to_many_composite_keys.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import batch_fetch
 from tests import TestCase
 
diff --git a/tests/batch_fetch/test_one_to_many_relationships.py b/tests/batch_fetch/test_one_to_many_relationships.py
index 876ae30..f782fe6 100644
--- a/tests/batch_fetch/test_one_to_many_relationships.py
+++ b/tests/batch_fetch/test_one_to_many_relationships.py
@@ -1,5 +1,6 @@
 import sqlalchemy as sa
 from pytest import raises
+
 from sqlalchemy_utils import batch_fetch
 from tests import TestCase
 
diff --git a/tests/functions/test_database.py b/tests/functions/test_database.py
index f72bd6b..ab14b85 100644
--- a/tests/functions/test_database.py
+++ b/tests/functions/test_database.py
@@ -3,20 +3,16 @@ import os
 import sqlalchemy as sa
 from flexmock import flexmock
 from pytest import mark
+
+from sqlalchemy_utils import create_database, database_exists, drop_database
+from tests import TestCase
+
 pymysql = None
 try:
     import pymysql  # noqa
 except ImportError:
     pass
 
-from tests import TestCase
-
-from sqlalchemy_utils import (
-    create_database,
-    drop_database,
-    database_exists,
-)
-
 
 class DatabaseTest(TestCase):
     def test_create_and_drop(self):
diff --git a/tests/functions/test_dependent_objects.py b/tests/functions/test_dependent_objects.py
index 06b4876..0702dd7 100644
--- a/tests/functions/test_dependent_objects.py
+++ b/tests/functions/test_dependent_objects.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import dependent_objects, get_referencing_foreign_keys
 from tests import TestCase
 
diff --git a/tests/functions/test_get_class_by_table.py b/tests/functions/test_get_class_by_table.py
index af1f529..99db410 100644
--- a/tests/functions/test_get_class_by_table.py
+++ b/tests/functions/test_get_class_by_table.py
@@ -1,6 +1,5 @@
-from pytest import raises
-
 import sqlalchemy as sa
+from pytest import raises
 from sqlalchemy.ext.declarative import declarative_base
 
 from sqlalchemy_utils import get_class_by_table
diff --git a/tests/functions/test_get_column_key.py b/tests/functions/test_get_column_key.py
index c7ed02f..486483c 100644
--- a/tests/functions/test_get_column_key.py
+++ b/tests/functions/test_get_column_key.py
@@ -1,7 +1,7 @@
 from copy import copy
-from pytest import raises
 
 import sqlalchemy as sa
+from pytest import raises
 from sqlalchemy.ext.declarative import declarative_base
 
 from sqlalchemy_utils import get_column_key
diff --git a/tests/functions/test_get_hybrid_properties.py b/tests/functions/test_get_hybrid_properties.py
index 68b2dd6..a37a664 100644
--- a/tests/functions/test_get_hybrid_properties.py
+++ b/tests/functions/test_get_hybrid_properties.py
@@ -1,6 +1,6 @@
 import sqlalchemy as sa
-from sqlalchemy.ext.hybrid import hybrid_property
 from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.ext.hybrid import hybrid_property
 
 from sqlalchemy_utils import get_hybrid_properties
 
diff --git a/tests/functions/test_get_mapper.py b/tests/functions/test_get_mapper.py
index 89088ee..766b495 100644
--- a/tests/functions/test_get_mapper.py
+++ b/tests/functions/test_get_mapper.py
@@ -1,9 +1,8 @@
-from pytest import raises
 import sqlalchemy as sa
+from pytest import raises
 from sqlalchemy.ext.declarative import declarative_base
 
 from sqlalchemy_utils import get_mapper
-
 from tests import TestCase
 
 
diff --git a/tests/functions/test_get_primary_keys.py b/tests/functions/test_get_primary_keys.py
index 060ebc5..73525be 100644
--- a/tests/functions/test_get_primary_keys.py
+++ b/tests/functions/test_get_primary_keys.py
@@ -1,12 +1,13 @@
-try:
-    from collections import OrderedDict
-except ImportError:
-    from ordereddict import OrderedDict
 import sqlalchemy as sa
 from sqlalchemy.ext.declarative import declarative_base
 
 from sqlalchemy_utils import get_primary_keys
 
+try:
+    from collections import OrderedDict
+except ImportError:
+    from ordereddict import OrderedDict
+
 
 class TestGetPrimaryKeys(object):
     def setup_method(self, method):
diff --git a/tests/functions/test_get_query_entities.py b/tests/functions/test_get_query_entities.py
index 448779c..e9a37e1 100644
--- a/tests/functions/test_get_query_entities.py
+++ b/tests/functions/test_get_query_entities.py
@@ -1,6 +1,6 @@
 import sqlalchemy as sa
-from sqlalchemy_utils import get_query_entities
 
+from sqlalchemy_utils import get_query_entities
 from tests import TestCase
 
 
diff --git a/tests/functions/test_get_referencing_foreign_keys.py b/tests/functions/test_get_referencing_foreign_keys.py
index 4e0660e..dc8a5de 100644
--- a/tests/functions/test_get_referencing_foreign_keys.py
+++ b/tests/functions/test_get_referencing_foreign_keys.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import get_referencing_foreign_keys
 from tests import TestCase
 
diff --git a/tests/functions/test_get_tables.py b/tests/functions/test_get_tables.py
index 58f4edc..682e782 100644
--- a/tests/functions/test_get_tables.py
+++ b/tests/functions/test_get_tables.py
@@ -1,7 +1,6 @@
 import sqlalchemy as sa
 
 from sqlalchemy_utils import get_tables
-
 from tests import TestCase
 
 
diff --git a/tests/functions/test_getdotattr.py b/tests/functions/test_getdotattr.py
index 6dae397..c768ecb 100644
--- a/tests/functions/test_getdotattr.py
+++ b/tests/functions/test_getdotattr.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.functions import getdotattr
 from tests import TestCase
 
diff --git a/tests/functions/test_has_unique_index.py b/tests/functions/test_has_unique_index.py
index 47ea1c4..157dfc8 100644
--- a/tests/functions/test_has_unique_index.py
+++ b/tests/functions/test_has_unique_index.py
@@ -1,5 +1,5 @@
-from pytest import raises
 import sqlalchemy as sa
+from pytest import raises
 from sqlalchemy.ext.declarative import declarative_base
 
 from sqlalchemy_utils import has_unique_index
diff --git a/tests/functions/test_identity.py b/tests/functions/test_identity.py
index f220f0d..d1d3d42 100644
--- a/tests/functions/test_identity.py
+++ b/tests/functions/test_identity.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.functions import identity
 from tests import TestCase
 
diff --git a/tests/functions/test_json_sql.py b/tests/functions/test_json_sql.py
index 7faf313..bb3766a 100644
--- a/tests/functions/test_json_sql.py
+++ b/tests/functions/test_json_sql.py
@@ -1,7 +1,7 @@
 import pytest
 import sqlalchemy as sa
-from sqlalchemy_utils import json_sql
 
+from sqlalchemy_utils import json_sql
 from tests import TestCase
 
 
diff --git a/tests/functions/test_make_order_by_deterministic.py b/tests/functions/test_make_order_by_deterministic.py
index 87f635d..70d9aa8 100644
--- a/tests/functions/test_make_order_by_deterministic.py
+++ b/tests/functions/test_make_order_by_deterministic.py
@@ -1,7 +1,6 @@
 import sqlalchemy as sa
 
 from sqlalchemy_utils.functions.sort_query import make_order_by_deterministic
-
 from tests import assert_contains, TestCase
 
 
diff --git a/tests/functions/test_merge_references.py b/tests/functions/test_merge_references.py
index e982bd8..e97f7a2 100644
--- a/tests/functions/test_merge_references.py
+++ b/tests/functions/test_merge_references.py
@@ -1,6 +1,6 @@
 import sqlalchemy as sa
-from sqlalchemy_utils import merge_references
 
+from sqlalchemy_utils import merge_references
 from tests import TestCase
 
 
diff --git a/tests/functions/test_non_indexed_foreign_keys.py b/tests/functions/test_non_indexed_foreign_keys.py
index 65b64df..46a9d51 100644
--- a/tests/functions/test_non_indexed_foreign_keys.py
+++ b/tests/functions/test_non_indexed_foreign_keys.py
@@ -1,6 +1,7 @@
 import sqlalchemy as sa
-from tests import TestCase
+
 from sqlalchemy_utils.functions import non_indexed_foreign_keys
+from tests import TestCase
 
 
 class TestFindNonIndexedForeignKeys(TestCase):
diff --git a/tests/functions/test_render.py b/tests/functions/test_render.py
index 8855400..13b2a38 100644
--- a/tests/functions/test_render.py
+++ b/tests/functions/test_render.py
@@ -1,10 +1,11 @@
 import sqlalchemy as sa
-from tests import TestCase
+
 from sqlalchemy_utils.functions import (
-    render_statement,
+    mock_engine,
     render_expression,
-    mock_engine
+    render_statement
 )
+from tests import TestCase
 
 
 class TestRender(TestCase):
diff --git a/tests/functions/test_table_name.py b/tests/functions/test_table_name.py
index 234d22f..6018110 100644
--- a/tests/functions/test_table_name.py
+++ b/tests/functions/test_table_name.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import table_name
 from tests import TestCase
 
diff --git a/tests/generic_relationship/__init__.py b/tests/generic_relationship/__init__.py
index caabb0c..9b2de76 100644
--- a/tests/generic_relationship/__init__.py
+++ b/tests/generic_relationship/__init__.py
@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
+
 import six
+
 from tests import TestCase
 
 
diff --git a/tests/generic_relationship/test_abstract_base_class.py b/tests/generic_relationship/test_abstract_base_class.py
index efdf79d..709f0db 100644
--- a/tests/generic_relationship/test_abstract_base_class.py
+++ b/tests/generic_relationship/test_abstract_base_class.py
@@ -1,7 +1,9 @@
 from __future__ import unicode_literals
+
 import sqlalchemy as sa
-from sqlalchemy_utils import generic_relationship
 from sqlalchemy.ext.declarative import declared_attr
+
+from sqlalchemy_utils import generic_relationship
 from tests.generic_relationship import GenericRelationshipTestCase
 
 
diff --git a/tests/generic_relationship/test_column_aliases.py b/tests/generic_relationship/test_column_aliases.py
index 3e34bc7..1d93c79 100644
--- a/tests/generic_relationship/test_column_aliases.py
+++ b/tests/generic_relationship/test_column_aliases.py
@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils import generic_relationship
 from tests.generic_relationship import GenericRelationshipTestCase
 
diff --git a/tests/generic_relationship/test_composite_keys.py b/tests/generic_relationship/test_composite_keys.py
index 6528e37..d730d09 100644
--- a/tests/generic_relationship/test_composite_keys.py
+++ b/tests/generic_relationship/test_composite_keys.py
@@ -1,6 +1,8 @@
 from __future__ import unicode_literals
+
 import six
 import sqlalchemy as sa
+
 from sqlalchemy_utils import generic_relationship
 from tests.generic_relationship import GenericRelationshipTestCase
 
diff --git a/tests/generic_relationship/test_hybrid_properties.py b/tests/generic_relationship/test_hybrid_properties.py
index 564e23a..ce4575f 100644
--- a/tests/generic_relationship/test_hybrid_properties.py
+++ b/tests/generic_relationship/test_hybrid_properties.py
@@ -1,7 +1,9 @@
 from __future__ import unicode_literals
+
 import six
 import sqlalchemy as sa
 from sqlalchemy.ext.hybrid import hybrid_property
+
 from sqlalchemy_utils import generic_relationship
 from tests import TestCase
 
diff --git a/tests/generic_relationship/test_single_table_inheritance.py b/tests/generic_relationship/test_single_table_inheritance.py
index ac9ad14..1013717 100644
--- a/tests/generic_relationship/test_single_table_inheritance.py
+++ b/tests/generic_relationship/test_single_table_inheritance.py
@@ -1,6 +1,8 @@
 from __future__ import unicode_literals
+
 import six
 import sqlalchemy as sa
+
 from sqlalchemy_utils import generic_relationship
 from tests import TestCase
 
diff --git a/tests/observes/test_o2m_o2m_o2m.py b/tests/observes/test_o2m_o2m_o2m.py
index 9656141..a11b378 100644
--- a/tests/observes/test_o2m_o2m_o2m.py
+++ b/tests/observes/test_o2m_o2m_o2m.py
@@ -1,7 +1,7 @@
 import sqlalchemy as sa
 
-from tests import TestCase
 from sqlalchemy_utils.observer import observes
+from tests import TestCase
 
 
 class TestObservesFor3LevelDeepOneToMany(TestCase):
diff --git a/tests/observes/test_o2m_o2o_o2m.py b/tests/observes/test_o2m_o2o_o2m.py
index a08aa09..2299280 100644
--- a/tests/observes/test_o2m_o2o_o2m.py
+++ b/tests/observes/test_o2m_o2o_o2m.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.observer import observes
 from tests import TestCase
 
diff --git a/tests/observes/test_o2o_o2o_o2o.py b/tests/observes/test_o2o_o2o_o2o.py
index a62feba..00cfca8 100644
--- a/tests/observes/test_o2o_o2o_o2o.py
+++ b/tests/observes/test_o2o_o2o_o2o.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.observer import observes
 from tests import TestCase
 
diff --git a/tests/primitives/test_weekdays.py b/tests/primitives/test_weekdays.py
index f9496a8..5e3f923 100644
--- a/tests/primitives/test_weekdays.py
+++ b/tests/primitives/test_weekdays.py
@@ -1,14 +1,15 @@
+import pytest
+import six
+from flexmock import flexmock
+
+from sqlalchemy_utils import i18n
+from sqlalchemy_utils.primitives import WeekDay, WeekDays
+
 Locale = None
 try:
     from babel import Locale
 except ImportError:
     pass
-from flexmock import flexmock
-import pytest
-
-import six
-from sqlalchemy_utils.primitives import WeekDay, WeekDays
-from sqlalchemy_utils import i18n
 
 
 @pytest.mark.skipif('Locale is None')
diff --git a/tests/relationships/test_chained_join.py b/tests/relationships/test_chained_join.py
index a19ebcf..aff42d4 100644
--- a/tests/relationships/test_chained_join.py
+++ b/tests/relationships/test_chained_join.py
@@ -3,7 +3,7 @@ from tests import TestCase
 from tests.mixins import (
     ThreeLevelDeepManyToMany,
     ThreeLevelDeepOneToMany,
-    ThreeLevelDeepOneToOne,
+    ThreeLevelDeepOneToOne
 )
 
 
diff --git a/tests/relationships/test_select_aggregate.py b/tests/relationships/test_select_aggregate.py
index 88d201f..f4fe687 100644
--- a/tests/relationships/test_select_aggregate.py
+++ b/tests/relationships/test_select_aggregate.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.aggregates import select_aggregate
 from tests import TestCase
 from tests.mixins import ThreeLevelDeepManyToMany
diff --git a/tests/test_asserts.py b/tests/test_asserts.py
index ea6d587..ba1f820 100644
--- a/tests/test_asserts.py
+++ b/tests/test_asserts.py
@@ -1,15 +1,15 @@
-import sqlalchemy as sa
 import pytest
+import sqlalchemy as sa
 from sqlalchemy.dialects.postgresql import ARRAY
+
 from sqlalchemy_utils import (
-    assert_min_value,
     assert_max_length,
     assert_max_value,
-    assert_nullable,
-    assert_non_nullable
+    assert_min_value,
+    assert_non_nullable,
+    assert_nullable
 )
 from sqlalchemy_utils.asserts import raises
-
 from tests import TestCase
 
 
diff --git a/tests/test_auto_delete_orphans.py b/tests/test_auto_delete_orphans.py
index d1c45ba..6efb5b9 100644
--- a/tests/test_auto_delete_orphans.py
+++ b/tests/test_auto_delete_orphans.py
@@ -1,7 +1,7 @@
-from pytest import raises
 import sqlalchemy as sa
-from sqlalchemy_utils import auto_delete_orphans, ImproperlyConfigured
+from pytest import raises
 
+from sqlalchemy_utils import auto_delete_orphans, ImproperlyConfigured
 from tests import TestCase
 
 
diff --git a/tests/test_case_insensitive_comparator.py b/tests/test_case_insensitive_comparator.py
index 56dd79b..19812e1 100644
--- a/tests/test_case_insensitive_comparator.py
+++ b/tests/test_case_insensitive_comparator.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import EmailType
 from tests import TestCase
 
diff --git a/tests/test_expression_parser.py b/tests/test_expression_parser.py
index 42a3b3c..d7cccac 100644
--- a/tests/test_expression_parser.py
+++ b/tests/test_expression_parser.py
@@ -1,8 +1,8 @@
-from sqlalchemy_utils import ExpressionParser
 import sqlalchemy as sa
 from sqlalchemy.sql.elements import Cast, Null
 
-from . import TestCase
+from sqlalchemy_utils import ExpressionParser
+from tests import TestCase
 
 
 class MyExpressionParser(ExpressionParser):
diff --git a/tests/test_expressions.py b/tests/test_expressions.py
index 0c0e80f..c692fb0 100644
--- a/tests/test_expressions.py
+++ b/tests/test_expressions.py
@@ -1,5 +1,6 @@
 import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
+
 from sqlalchemy_utils.expressions import explain, explain_analyze
 from tests import TestCase
 
diff --git a/tests/test_generates.py b/tests/test_generates.py
index 532c62b..2917905 100644
--- a/tests/test_generates.py
+++ b/tests/test_generates.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import generates
 from tests import TestCase
 
diff --git a/tests/test_instant_defaults_listener.py b/tests/test_instant_defaults_listener.py
index fa1a2d4..0ec444a 100644
--- a/tests/test_instant_defaults_listener.py
+++ b/tests/test_instant_defaults_listener.py
@@ -1,9 +1,10 @@
 from datetime import datetime
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils.listeners import force_instant_defaults
 from tests import TestCase
 
-
 force_instant_defaults()
 
 
diff --git a/tests/test_models.py b/tests/test_models.py
index 5968e1e..83aa912 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -1,5 +1,7 @@
 from datetime import datetime
+
 import sqlalchemy as sa
+
 from sqlalchemy_utils import Timestamp
 from tests import TestCase
 
diff --git a/tests/test_path.py b/tests/test_path.py
index 3246fa1..06af498 100644
--- a/tests/test_path.py
+++ b/tests/test_path.py
@@ -2,7 +2,8 @@ import six
 import sqlalchemy as sa
 from pytest import mark
 from sqlalchemy.util.langhelpers import symbol
-from sqlalchemy_utils.path import Path, AttrPath
+
+from sqlalchemy_utils.path import AttrPath, Path
 from tests import TestCase
 
 
diff --git a/tests/test_proxy_dict.py b/tests/test_proxy_dict.py
index 58bec79..a87f39c 100644
--- a/tests/test_proxy_dict.py
+++ b/tests/test_proxy_dict.py
@@ -1,6 +1,7 @@
-from flexmock import flexmock
 import sqlalchemy as sa
-from sqlalchemy_utils import ProxyDict, proxy_dict
+from flexmock import flexmock
+
+from sqlalchemy_utils import proxy_dict, ProxyDict
 from tests import TestCase
 
 
diff --git a/tests/test_query_chain.py b/tests/test_query_chain.py
index 7796ff7..89b4ea4 100644
--- a/tests/test_query_chain.py
+++ b/tests/test_query_chain.py
@@ -1,6 +1,6 @@
 import sqlalchemy as sa
-from sqlalchemy_utils import QueryChain
 
+from sqlalchemy_utils import QueryChain
 from tests import TestCase
 
 
diff --git a/tests/test_sort_query.py b/tests/test_sort_query.py
index 2f8332c..ef84270 100644
--- a/tests/test_sort_query.py
+++ b/tests/test_sort_query.py
@@ -1,5 +1,6 @@
-from pytest import raises
 import sqlalchemy as sa
+from pytest import raises
+
 from sqlalchemy_utils import sort_query
 from sqlalchemy_utils.functions import QuerySorterException
 from tests import assert_contains, TestCase
diff --git a/tests/test_translation_hybrid.py b/tests/test_translation_hybrid.py
index a11e402..66c5116 100644
--- a/tests/test_translation_hybrid.py
+++ b/tests/test_translation_hybrid.py
@@ -1,7 +1,7 @@
 import sqlalchemy as sa
 from sqlalchemy.dialects.postgresql import HSTORE
-from sqlalchemy_utils import TranslationHybrid
 
+from sqlalchemy_utils import TranslationHybrid
 from tests import TestCase
 
 
diff --git a/tests/types/test_arrow.py b/tests/types/test_arrow.py
index c1b4f00..f3ca975 100644
--- a/tests/types/test_arrow.py
+++ b/tests/types/test_arrow.py
@@ -1,6 +1,8 @@
 from datetime import datetime
-from pytest import mark
+
 import sqlalchemy as sa
+from pytest import mark
+
 from sqlalchemy_utils.types import arrow
 from tests import TestCase
 
diff --git a/tests/types/test_choice.py b/tests/types/test_choice.py
index d82177e..c11bdfe 100644
--- a/tests/types/test_choice.py
+++ b/tests/types/test_choice.py
@@ -1,7 +1,8 @@
-from flexmock import flexmock
-from pytest import raises, mark
 import sqlalchemy as sa
-from sqlalchemy_utils import ChoiceType, Choice, ImproperlyConfigured
+from flexmock import flexmock
+from pytest import mark, raises
+
+from sqlalchemy_utils import Choice, ChoiceType, ImproperlyConfigured
 from sqlalchemy_utils.types.choice import Enum
 from tests import TestCase
 
diff --git a/tests/types/test_color.py b/tests/types/test_color.py
index 37366f0..aa1d60c 100644
--- a/tests/types/test_color.py
+++ b/tests/types/test_color.py
@@ -1,6 +1,7 @@
+import sqlalchemy as sa
 from flexmock import flexmock
 from pytest import mark
-import sqlalchemy as sa
+
 from sqlalchemy_utils import ColorType, types  # noqa
 from tests import TestCase
 
diff --git a/tests/types/test_country.py b/tests/types/test_country.py
index 07821ad..2df8ff3 100644
--- a/tests/types/test_country.py
+++ b/tests/types/test_country.py
@@ -1,5 +1,6 @@
 import sqlalchemy as sa
-from sqlalchemy_utils import CountryType, Country
+
+from sqlalchemy_utils import Country, CountryType
 from tests import TestCase
 
 
diff --git a/tests/types/test_email.py b/tests/types/test_email.py
index 06d03a5..5b65f71 100644
--- a/tests/types/test_email.py
+++ b/tests/types/test_email.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils import EmailType
 from tests import TestCase
 
diff --git a/tests/types/test_encrypted.py b/tests/types/test_encrypted.py
index 7b28866..a91e642 100644
--- a/tests/types/test_encrypted.py
+++ b/tests/types/test_encrypted.py
@@ -1,17 +1,19 @@
-import sqlalchemy as sa
-from datetime import datetime, date, time
+from datetime import date, datetime, time
+
 import pytest
+import sqlalchemy as sa
 from pytest import mark
+
+from sqlalchemy_utils import ColorType, EncryptedType, PhoneNumberType
+from sqlalchemy_utils.types.encrypted import AesEngine, FernetEngine
+from tests import TestCase
+
 cryptography = None
 try:
     import cryptography  # noqa
 except ImportError:
     pass
 
-from tests import TestCase
-from sqlalchemy_utils import EncryptedType, PhoneNumberType, ColorType
-from sqlalchemy_utils.types.encrypted import AesEngine, FernetEngine
-
 
 @mark.skipif('cryptography is None')
 class EncryptedTypeTestCase(TestCase):
diff --git a/tests/types/test_int_range.py b/tests/types/test_int_range.py
index a547d52..fd60dac 100644
--- a/tests/types/test_int_range.py
+++ b/tests/types/test_int_range.py
@@ -1,5 +1,9 @@
-from pytest import mark
 import sqlalchemy as sa
+from pytest import mark
+
+from sqlalchemy_utils import IntRangeType
+from tests import TestCase
+
 intervals = None
 inf = -1
 try:
@@ -7,8 +11,6 @@ try:
     from infinity import inf
 except ImportError:
     pass
-from tests import TestCase
-from sqlalchemy_utils import IntRangeType
 
 
 @mark.skipif('intervals is None')
diff --git a/tests/types/test_ip_address.py b/tests/types/test_ip_address.py
index a3725ba..3b5a4e5 100644
--- a/tests/types/test_ip_address.py
+++ b/tests/types/test_ip_address.py
@@ -1,6 +1,7 @@
-from pytest import mark
 import six
 import sqlalchemy as sa
+from pytest import mark
+
 from sqlalchemy_utils.types import ip_address
 from tests import TestCase
 
diff --git a/tests/types/test_json.py b/tests/types/test_json.py
index ab4939a..8305a36 100644
--- a/tests/types/test_json.py
+++ b/tests/types/test_json.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
-from pytest import mark
 import sqlalchemy as sa
+from pytest import mark
+
 from sqlalchemy_utils.types import json
 from tests import TestCase
 
diff --git a/tests/types/test_locale.py b/tests/types/test_locale.py
index 9eaa03a..573aa3d 100644
--- a/tests/types/test_locale.py
+++ b/tests/types/test_locale.py
@@ -1,5 +1,6 @@
-from pytest import mark, raises
 import sqlalchemy as sa
+from pytest import mark, raises
+
 from sqlalchemy_utils.types import locale
 from tests import TestCase
 
diff --git a/tests/types/test_numeric_range.py b/tests/types/test_numeric_range.py
index 26ec82f..25923f6 100644
--- a/tests/types/test_numeric_range.py
+++ b/tests/types/test_numeric_range.py
@@ -1,16 +1,17 @@
 from decimal import Decimal
 
-
-from pytest import mark
 import sqlalchemy as sa
+from pytest import mark
+
+from sqlalchemy_utils import NumericRangeType
+from tests import TestCase
+
 intervals = None
 try:
     import intervals
     from infinity import inf
 except ImportError:
     pass
-from tests import TestCase
-from sqlalchemy_utils import NumericRangeType
 
 
 @mark.skipif('intervals is None')
diff --git a/tests/types/test_password.py b/tests/types/test_password.py
index 8f28133..474ad94 100644
--- a/tests/types/test_password.py
+++ b/tests/types/test_password.py
@@ -1,8 +1,9 @@
-from pytest import mark
 import sqlalchemy as sa
-from tests import TestCase
+from pytest import mark
 from sqlalchemy import inspect
+
 from sqlalchemy_utils import Password, PasswordType, types  # noqa
+from tests import TestCase
 
 
 @mark.skipif('types.password.passlib is None')
diff --git a/tests/types/test_phonenumber.py b/tests/types/test_phonenumber.py
index fbeb1db..5f83571 100644
--- a/tests/types/test_phonenumber.py
+++ b/tests/types/test_phonenumber.py
@@ -2,8 +2,8 @@ import six
 import sqlalchemy as sa
 from pytest import mark
 
+from sqlalchemy_utils import PhoneNumber, PhoneNumberType, types  # noqa
 from tests import TestCase
-from sqlalchemy_utils import PhoneNumberType, PhoneNumber, types  # noqa
 
 
 @mark.skipif('types.phone_number.phonenumbers is None')
diff --git a/tests/types/test_scalar_list.py b/tests/types/test_scalar_list.py
index 89ce841..3f556fc 100644
--- a/tests/types/test_scalar_list.py
+++ b/tests/types/test_scalar_list.py
@@ -1,7 +1,8 @@
 import six
 import sqlalchemy as sa
-from sqlalchemy_utils import ScalarListType
 from pytest import raises
+
+from sqlalchemy_utils import ScalarListType
 from tests import TestCase
 
 
diff --git a/tests/types/test_timezone.py b/tests/types/test_timezone.py
index 0110be7..3d8a11c 100644
--- a/tests/types/test_timezone.py
+++ b/tests/types/test_timezone.py
@@ -1,4 +1,5 @@
 import sqlalchemy as sa
+
 from sqlalchemy_utils.types import timezone
 from tests import TestCase
 
diff --git a/tests/types/test_tsvector.py b/tests/types/test_tsvector.py
index bb5fda9..5a75a91 100644
--- a/tests/types/test_tsvector.py
+++ b/tests/types/test_tsvector.py
@@ -1,5 +1,6 @@
 import sqlalchemy as sa
 from sqlalchemy.dialects.postgresql import TSVECTOR
+
 from sqlalchemy_utils import TSVectorType
 from tests import TestCase
 
diff --git a/tests/types/test_url.py b/tests/types/test_url.py
index f23b1a8..63970d4 100644
--- a/tests/types/test_url.py
+++ b/tests/types/test_url.py
@@ -1,7 +1,7 @@
-from pytest import mark
 import sqlalchemy as sa
-from sqlalchemy_utils.types import url
+from pytest import mark
 
+from sqlalchemy_utils.types import url
 from tests import TestCase
 
 
diff --git a/tests/types/test_uuid.py b/tests/types/test_uuid.py
index 5a1de10..5bc4437 100644
--- a/tests/types/test_uuid.py
+++ b/tests/types/test_uuid.py
@@ -1,8 +1,10 @@
-import sqlalchemy as sa
-from tests import TestCase
-from sqlalchemy_utils import UUIDType
 import uuid
 
+import sqlalchemy as sa
+
+from sqlalchemy_utils import UUIDType
+from tests import TestCase
+
 
 class TestUUIDType(TestCase):
     def create_models(self):
diff --git a/tests/types/test_weekdays.py b/tests/types/test_weekdays.py
index afdedbb..d9c03d0 100644
--- a/tests/types/test_weekdays.py
+++ b/tests/types/test_weekdays.py
@@ -1,10 +1,10 @@
 import pytest
 import sqlalchemy as sa
+
+from sqlalchemy_utils import i18n
+from sqlalchemy_utils.primitives import WeekDays
 from sqlalchemy_utils.types import WeekDaysType
 from sqlalchemy_utils.types.weekdays import babel
-from sqlalchemy_utils.primitives import WeekDays
-from sqlalchemy_utils import i18n
-
 from tests import TestCase