Adds pre-commit config to run various lintersci_improvements

This ads black, isort, pyupgrade, and flake8 to pre-commit-config.yaml
There are also some small changes to travis.yml and tasks.py to reduce
some repeated configurations that should be consolidated into
setup.cfg. Most other changes are automated by the linter scripts.

1 files changed, 27 insertions, 17 deletions

diff --git a/setup.py b/setup.py
index 123a045f..324ebd28 100755
--- a/setup.py
+++ b/setup.py
@@ -12,8 +12,12 @@ DESCRIPTION = "cmd2 - quickly build feature-rich and user-friendly interactive c
 with codecs.open('README.md', encoding='utf8') as f:
     LONG_DESCRIPTION = f.read()
 
-CLASSIFIERS = list(filter(None, map(str.strip,
-"""
+CLASSIFIERS = list(
+    filter(
+        None,
+        map(
+            str.strip,
+            """
 Development Status :: 5 - Production/Stable
 Environment :: Console
 Operating System :: OS Independent
@@ -29,7 +33,10 @@ Programming Language :: Python :: 3.8
 Programming Language :: Python :: 3.9
 Programming Language :: Python :: Implementation :: CPython
 Topic :: Software Development :: Libraries :: Python Modules
-""".splitlines())))  # noqa: E128
+""".splitlines(),
+        ),
+    )
+)  # noqa: E128
 
 SETUP_REQUIRES = ['setuptools >= 34.4', 'setuptools_scm >= 3.0']
 
@@ -55,24 +62,27 @@ EXTRAS_REQUIRE = {
         'pytest-mock',
     ],
     # development only dependencies:  install with 'pip install -e .[dev]'
-    'dev': ["mock ; python_version<'3.6'",  # for python 3.5 we need the third party mock module
-            "pytest>=4.6",
-            'codecov',
-            'pytest-cov',
-            'pytest-mock',
-            "nox==2019.11.9 ; python_version=='3.5.2'",
-            "nox ; python_version>'3.5.2'",
-            'flake8',
-            'sphinx', 'sphinx-rtd-theme', 'sphinx-autobuild', 'doc8',
-            'invoke', 'twine>=1.11',
-            ]
+    'dev': [
+        "mock ; python_version<'3.6'",  # for python 3.5 we need the third party mock module
+        "pytest>=4.6",
+        'codecov',
+        'pytest-cov',
+        'pytest-mock',
+        "nox==2019.11.9 ; python_version=='3.5.2'",
+        "nox ; python_version>'3.5.2'",
+        'flake8',
+        'sphinx',
+        'sphinx-rtd-theme',
+        'sphinx-autobuild',
+        'doc8',
+        'invoke',
+        'twine>=1.11',
+    ],
 }
 
 setup(
     name="cmd2",
-    use_scm_version={
-        'git_describe_command': 'git describe --dirty --tags --long --exclude plugin-*'
-    },
+    use_scm_version={'git_describe_command': 'git describe --dirty --tags --long --exclude plugin-*'},
     description=DESCRIPTION,
     long_description=LONG_DESCRIPTION,
     long_description_content_type='text/markdown',