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, 3 insertions, 4 deletions

diff --git a/examples/modular_commands/commandset_complex.py b/examples/modular_commands/commandset_complex.py
index 579c0677..03bc2507 100644
--- a/examples/modular_commands/commandset_complex.py
+++ b/examples/modular_commands/commandset_complex.py
@@ -27,9 +27,8 @@ class CommandSetA(cmd2.CommandSet):
     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')
@@ -39,7 +38,7 @@ class CommandSetA(cmd2.CommandSet):
     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))
 
     def complete_durian(self, text: str, line: str, begidx: int, endidx: int) -> List[str]:
         return utils.basic_complete(text, line, begidx, endidx, ['stinks', 'smells', 'disgusting'])