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, 7 insertions, 5 deletions

diff --git a/tests_isolated/test_commandset/test_commandset.py b/tests_isolated/test_commandset/test_commandset.py
index 21cce8bf..b6761642 100644
--- a/tests_isolated/test_commandset/test_commandset.py
+++ b/tests_isolated/test_commandset/test_commandset.py
@@ -11,9 +11,10 @@ import pytest
 
 import cmd2
 from cmd2 import utils
-from .conftest import complete_tester, WithCommandSets
 from cmd2.exceptions import CommandSetRegistrationError
 
+from .conftest import WithCommandSets, complete_tester
+
 
 class CommandSetBase(cmd2.CommandSet):
     pass
@@ -51,9 +52,8 @@ class CommandSetA(CommandSetBase):
     def do_cranberry(self, ns: argparse.Namespace, unknown: List[str]):
         self._cmd.poutput('Cranberry {}!!'.format(ns.arg1))
         if unknown and len(unknown):
-            self._cmd.poutput('Unknown: ' + ', '.join(['{}']*len(unknown)).format(*unknown))
-        self._cmd.last_result = {'arg1': ns.arg1,
-                           'unknown': unknown}
+            self._cmd.poutput('Unknown: ' + ', '.join(['{}'] * len(unknown)).format(*unknown))
+        self._cmd.last_result = {'arg1': ns.arg1, 'unknown': unknown}
 
     def help_cranberry(self):
         self._cmd.stdout.write('This command does diddly squat...\n')
@@ -63,7 +63,7 @@ class CommandSetA(CommandSetBase):
     def do_durian(self, args: List[str]):
         """Durian Command"""
         self._cmd.poutput('{} Arguments: '.format(len(args)))
-        self._cmd.poutput(', '.join(['{}']*len(args)).format(*args))
+        self._cmd.poutput(', '.join(['{}'] * len(args)).format(*args))
         self._cmd.last_result = {'args': args}
 
     def complete_durian(self, text: str, line: str, begidx: int, endidx: int) -> List[str]:
@@ -567,6 +567,7 @@ def test_subcommands(command_sets_manual):
     command_sets_manual.unregister_command_set(veg_cmds)
     command_sets_manual.unregister_command_set(base_cmds)
 
+
 def test_nested_subcommands(command_sets_manual):
     base_cmds = LoadableBase(1)
     pasta_cmds = LoadablePastaStir(1)
@@ -614,6 +615,7 @@ def test_nested_subcommands(command_sets_manual):
 
 class AppWithSubCommands(cmd2.Cmd):
     """Class for testing usage of `as_subcommand_to` decorator directly in a Cmd2 subclass."""
+
     def __init__(self, *args, **kwargs):
         super(AppWithSubCommands, self).__init__(*args, **kwargs)