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, 9 insertions, 4 deletions

diff --git a/examples/initialization.py b/examples/initialization.py
index 50bb73aa..6137c6a7 100755
--- a/examples/initialization.py
+++ b/examples/initialization.py
@@ -20,8 +20,12 @@ class BasicApp(cmd2.Cmd):
     CUSTOM_CATEGORY = 'My Custom Commands'
 
     def __init__(self):
-        super().__init__(multiline_commands=['echo'], persistent_history_file='cmd2_history.dat',
-                         startup_script='scripts/startup.txt', use_ipython=True)
+        super().__init__(
+            multiline_commands=['echo'],
+            persistent_history_file='cmd2_history.dat',
+            startup_script='scripts/startup.txt',
+            use_ipython=True,
+        )
 
         # Prints an intro banner once upon application startup
         self.intro = style('Welcome to cmd2!', fg=fg.red, bg=bg.white, bold=True)
@@ -42,8 +46,9 @@ class BasicApp(cmd2.Cmd):
         self.foreground_color = 'cyan'
 
         # Make echo_fg settable at runtime
-        self.add_settable(cmd2.Settable('foreground_color', str, 'Foreground color to use with echo command',
-                                        choices=fg.colors()))
+        self.add_settable(
+            cmd2.Settable('foreground_color', str, 'Foreground color to use with echo command', choices=fg.colors())
+        )
 
     @cmd2.with_category(CUSTOM_CATEGORY)
     def do_intro(self, _):