5a6f89265b
As part of the move towards testr and parallel test running, we start to use testtools and fixtures to make the test suite resilient and more pedantic. Part of blueprint grizzly-testtools Change-Id: I90250de9fe21237db34f6a50b89b15863e270aa5
222 lines
6.1 KiB
ReStructuredText
222 lines
6.1 KiB
ReStructuredText
Quantum Style Commandments
|
|
==========================
|
|
|
|
- Step 1: Read http://www.python.org/dev/peps/pep-0008/
|
|
- Step 2: Read http://www.python.org/dev/peps/pep-0008/ again
|
|
- Step 3: Read on
|
|
|
|
|
|
General
|
|
-------
|
|
- Put two newlines between top-level code (funcs, classes, etc)
|
|
- Put one newline between methods in classes and anywhere else
|
|
- Do not write "except:", use "except Exception:" at the very least
|
|
- Include your name with TODOs as in "#TODO(termie)"
|
|
- Do not shadow a built-in or reserved word. Example::
|
|
|
|
def list():
|
|
return [1, 2, 3]
|
|
|
|
mylist = list() # BAD, shadows `list` built-in
|
|
|
|
class Foo(object):
|
|
def list(self):
|
|
return [1, 2, 3]
|
|
|
|
mylist = Foo().list() # OKAY, does not shadow built-in
|
|
|
|
|
|
Imports
|
|
-------
|
|
- Do not make relative imports
|
|
- Order your imports by the full module path
|
|
|
|
Example::
|
|
|
|
The following imports,
|
|
|
|
from quantum.api import networks
|
|
from quantum import wsgi
|
|
|
|
are considered equivalent for ordering purposes to
|
|
|
|
import quantum.api.networks
|
|
import quantum.wsgi
|
|
|
|
- Organize your imports according to the following template
|
|
|
|
Example::
|
|
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
{{stdlib imports in human alphabetical order}}
|
|
\n
|
|
{{third-party lib imports in human alphabetical order}}
|
|
\n
|
|
{{quantum imports in human alphabetical order}}
|
|
\n
|
|
\n
|
|
{{begin your code}}
|
|
|
|
|
|
Human Alphabetical Order Examples
|
|
---------------------------------
|
|
Example::
|
|
|
|
import httplib
|
|
import random
|
|
import StringIO
|
|
import time
|
|
|
|
import eventlet
|
|
import testtools
|
|
import webob.exc
|
|
|
|
import quantum.api.networks
|
|
from quantum.api import ports
|
|
from quantum.db import models
|
|
from quantum.extensions import multiport
|
|
from quantum.openstack.common import log as logging
|
|
import quantum.manager
|
|
from quantum import service
|
|
|
|
|
|
Docstrings
|
|
----------
|
|
Example::
|
|
|
|
"""A one line docstring looks like this and ends in a period."""
|
|
|
|
|
|
"""A multiline docstring has a one-line summary, less than 80 characters.
|
|
|
|
Then a new paragraph after a newline that explains in more detail any
|
|
general information about the function, class or method. Example usages
|
|
are also great to have here if it is a complex class for function.
|
|
|
|
When writing the docstring for a class, an extra line should be placed
|
|
after the closing quotations. For more in-depth explanations for these
|
|
decisions see http://www.python.org/dev/peps/pep-0257/
|
|
|
|
If you are going to describe parameters and return values, use Sphinx, the
|
|
appropriate syntax is as follows.
|
|
|
|
:param foo: the foo parameter
|
|
:param bar: the bar parameter
|
|
:returns: return_type -- description of the return value
|
|
:returns: description of the return value
|
|
:raises: AttributeError, KeyError
|
|
"""
|
|
|
|
|
|
Dictionaries/Lists
|
|
------------------
|
|
If a dictionary (dict) or list object is longer than 80 characters, its items
|
|
should be split with newlines. Embedded iterables should have their items
|
|
indented. Additionally, the last item in the dictionary should have a trailing
|
|
comma. This increases readability and simplifies future diffs.
|
|
|
|
Example::
|
|
|
|
my_dictionary = {
|
|
"image": {
|
|
"name": "Just a Snapshot",
|
|
"size": 2749573,
|
|
"properties": {
|
|
"user_id": 12,
|
|
"arch": "x86_64",
|
|
},
|
|
"things": [
|
|
"thing_one",
|
|
"thing_two",
|
|
],
|
|
"status": "ACTIVE",
|
|
},
|
|
}
|
|
|
|
|
|
Calling Methods
|
|
---------------
|
|
Calls to methods 80 characters or longer should format each argument with
|
|
newlines. This is not a requirement, but a guideline::
|
|
|
|
unnecessarily_long_function_name('string one',
|
|
'string two',
|
|
kwarg1=constants.ACTIVE,
|
|
kwarg2=['a', 'b', 'c'])
|
|
|
|
|
|
Rather than constructing parameters inline, it is better to break things up::
|
|
|
|
list_of_strings = [
|
|
'what_a_long_string',
|
|
'not as long',
|
|
]
|
|
|
|
dict_of_numbers = {
|
|
'one': 1,
|
|
'two': 2,
|
|
'twenty four': 24,
|
|
}
|
|
|
|
object_one.call_a_method('string three',
|
|
'string four',
|
|
kwarg1=list_of_strings,
|
|
kwarg2=dict_of_numbers)
|
|
|
|
|
|
Internationalization (i18n) Strings
|
|
-----------------------------------
|
|
In order to support multiple languages, we have a mechanism to support
|
|
automatic translations of exception and log strings.
|
|
|
|
Example::
|
|
|
|
msg = _("An error occurred")
|
|
raise HTTPBadRequest(explanation=msg)
|
|
|
|
If you have a variable to place within the string, first internationalize the
|
|
template string then do the replacement.
|
|
|
|
Example::
|
|
|
|
msg = _("Missing parameter: %s") % ("flavor",)
|
|
LOG.error(msg)
|
|
|
|
If you have multiple variables to place in the string, use keyword parameters.
|
|
This helps our translators reorder parameters when needed.
|
|
|
|
Example::
|
|
|
|
msg = _("The server with id %(s_id)s has no key %(m_key)s")
|
|
LOG.error(msg % {"s_id": "1234", "m_key": "imageId"})
|
|
|
|
|
|
Creating Unit Tests
|
|
-------------------
|
|
For every new feature, unit tests should be created that both test and
|
|
(implicitly) document the usage of said feature. If submitting a patch for a
|
|
bug that had no unit test, a new passing unit test should be added. If a
|
|
submitted bug fix does have a unit test, be sure to add a new one that fails
|
|
without the patch and passes with the patch.
|
|
|
|
All unittest classes must ultimately inherit from testtools.TestCase.
|
|
All setUp and tearDown methods must upcall using the super() method.
|
|
tearDown methods should be avoided and addCleanup calls should be preferred.
|
|
Never manually create tempfiles. Always use the tempfile fixtures from
|
|
the fixture library to ensure that they are cleaned up.
|
|
|
|
|
|
openstack-common
|
|
----------------
|
|
|
|
A number of modules from openstack-common are imported into the project.
|
|
|
|
These modules are "incubating" in openstack-common and are kept in sync
|
|
with the help of openstack-common's update.py script. See:
|
|
|
|
http://wiki.openstack.org/CommonLibrary#Incubation
|
|
|
|
The copy of the code should never be directly modified here. Please
|
|
always update openstack-common first and then run the script to copy
|
|
the changes across.
|