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.

2 files changed, 26 insertions, 32 deletions

diff --git a/examples/modular_commands/commandset_basic.py b/examples/modular_commands/commandset_basic.py
index 2ceda439..cb1b07bc 100644
--- a/examples/modular_commands/commandset_basic.py
+++ b/examples/modular_commands/commandset_basic.py
@@ -15,14 +15,13 @@ class BasicCompletionCommandSet(CommandSet):
     sport_item_strs = ['Bat', 'Basket', 'Basketball', 'Football', 'Space Ball']
 
     # This data is used to demonstrate delimiter_complete
-    file_strs = \
-        [
-            '/home/user/file.db',
-            '/home/user/file space.db',
-            '/home/user/another.db',
-            '/home/other user/maps.db',
-            '/home/other user/tests.db'
-        ]
+    file_strs = [
+        '/home/user/file.db',
+        '/home/user/file space.db',
+        '/home/user/another.db',
+        '/home/other user/maps.db',
+        '/home/other user/tests.db',
+    ]
 
     def do_flag_based(self, cmd: Cmd, statement: Statement):
         """Tab completes arguments based on a preceding flag using flag_based_complete
@@ -34,20 +33,17 @@ class BasicCompletionCommandSet(CommandSet):
 
     def complete_flag_based(self, cmd: Cmd, text: str, line: str, begidx: int, endidx: int) -> List[str]:
         """Completion function for do_flag_based"""
-        flag_dict = \
-            {
-                # Tab complete food items after -f and --food flags in command line
-                '-f': self.food_item_strs,
-                '--food': self.food_item_strs,
-
-                # Tab complete sport items after -s and --sport flags in command line
-                '-s': self.sport_item_strs,
-                '--sport': self.sport_item_strs,
-
-                # Tab complete using path_complete function after -p and --path flags in command line
-                '-p': cmd.path_complete,
-                '--path': cmd.path_complete,
-            }
+        flag_dict = {
+            # Tab complete food items after -f and --food flags in command line
+            '-f': self.food_item_strs,
+            '--food': self.food_item_strs,
+            # Tab complete sport items after -s and --sport flags in command line
+            '-s': self.sport_item_strs,
+            '--sport': self.sport_item_strs,
+            # Tab complete using path_complete function after -p and --path flags in command line
+            '-p': cmd.path_complete,
+            '--path': cmd.path_complete,
+        }
 
         return cmd.flag_based_complete(text, line, begidx, endidx, flag_dict=flag_dict)
 
@@ -57,12 +53,11 @@ class BasicCompletionCommandSet(CommandSet):
 
     def complete_index_based(self, cmd: Cmd, text: str, line: str, begidx: int, endidx: int) -> List[str]:
         """Completion function for do_index_based"""
-        index_dict = \
-            {
-                1: self.food_item_strs,  # Tab complete food items at index 1 in command line
-                2: self.sport_item_strs,  # Tab complete sport items at index 2 in command line
-                3: cmd.path_complete,  # Tab complete using path_complete function at index 3 in command line
-            }
+        index_dict = {
+            1: self.food_item_strs,  # Tab complete food items at index 1 in command line
+            2: self.sport_item_strs,  # Tab complete sport items at index 2 in command line
+            3: cmd.path_complete,  # Tab complete using path_complete function at index 3 in command line
+        }
 
         return cmd.index_based_complete(text, line, begidx, endidx, index_dict=index_dict)
 
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'])