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, 8 insertions, 4 deletions

diff --git a/cmd2/py_bridge.py b/cmd2/py_bridge.py
index 38fef142..a1dfafcb 100644
--- a/cmd2/py_bridge.py
+++ b/cmd2/py_bridge.py
@@ -47,6 +47,7 @@ class CommandResult(namedtuple_with_defaults('CommandResult', ['stdout', 'stderr
        Named tuples are immutable. The contents are there for access,
        not for modification.
     """
+
     def __bool__(self) -> bool:
         """Returns True if the command succeeded, otherwise False"""
 
@@ -61,6 +62,7 @@ class CommandResult(namedtuple_with_defaults('CommandResult', ['stdout', 'stderr
 
 class PyBridge:
     """Provides a Python API wrapper for application commands."""
+
     def __init__(self, cmd2_app):
         self._cmd2_app = cmd2_app
         self.cmd_echo = False
@@ -109,8 +111,10 @@ class PyBridge:
                 self.stop = stop or self.stop
 
         # Save the output. If stderr is empty, set it to None.
-        result = CommandResult(stdout=copy_cmd_stdout.getvalue(),
-                               stderr=copy_stderr.getvalue() if copy_stderr.getvalue() else None,
-                               stop=stop,
-                               data=self._cmd2_app.last_result)
+        result = CommandResult(
+            stdout=copy_cmd_stdout.getvalue(),
+            stderr=copy_stderr.getvalue() if copy_stderr.getvalue() else None,
+            stop=stop,
+            data=self._cmd2_app.last_result,
+        )
         return result