Switch to flake8>3.8.1

Change-Id: I9c08ab3ec1ee00ca7a878dc0c9072bf67027c4fd

linters-requirements.txt

@@ -1,7 +1,7 @@
 # pep8 and flake8 requirements
 
 ansible-lint==4.2.0        # MIT
-flake8==3.3.0              # MIT
+flake8>=3.8.1              # MIT
 flake8-import-order==0.12  # LGPLv3
 mypy>=0.740                # MIT
 pylint>=1.9,<2.5.0  # GPLv2

tobiko/shell/sh/_local.py

@@ -66,7 +66,7 @@ class LocalExecutePathFixture(_path.ExecutePathFixture):
 
     executable_dirs = [os.path.realpath(os.path.join(d, 'bin'))
                        for d in [sys.prefix, sys.exec_prefix]]
-    environ = os.environ
+    environ = dict(os.environ)
 
 
 class LocalShellProcessFixture(_process.ShellProcessFixture):

tobiko/shell/sh/_path.py

@@ -15,6 +15,8 @@
 #    under the License.
 from __future__ import absolute_import
 
+import typing  # noqa
+
 from oslo_log import log
 
 import tobiko

tobiko/shell/ssh/_client.py

@@ -198,7 +198,7 @@ def _items_from_object(obj, schema):
 
 
 def exclude_mapping_items(mapping, exclude):
-        # Exclude parameters that are already in target dictionary
+    """Exclude parameters that are already in target dictionary"""
     return {key: value
             for key, value in mapping.items()
             if key not in exclude}