Added info on semantic versioning and branching strategy to CONTRIBUTING.md

Also:
- Added isort to Pipenv dev
- Added setup.cfg to make it easy to run flake8, doc8, and isort directly from the command line without using invoke
- Ran isort to sort includes

15 files changed, 20 insertions, 14 deletions

diff --git a/examples/alias_startup.py b/examples/alias_startup.py
index 052d1367..3fa9ec5a 100755
--- a/examples/alias_startup.py
+++ b/examples/alias_startup.py
@@ -5,6 +5,7 @@
     2) How to run an initialization script at startup
 """
 import os
+
 import cmd2
 
 
diff --git a/examples/argparse_completion.py b/examples/argparse_completion.py
index bf2b2723..e44533b3 100644
--- a/examples/argparse_completion.py
+++ b/examples/argparse_completion.py
@@ -6,8 +6,8 @@ A simple example demonstrating how to integrate tab completion with argparse-bas
 import argparse
 from typing import Dict, List
 
-from cmd2 import Cmd, Cmd2ArgumentParser, with_argparser, CompletionItem
-from cmd2.utils import basic_complete, CompletionError
+from cmd2 import Cmd, Cmd2ArgumentParser, CompletionItem, with_argparser
+from cmd2.utils import CompletionError, basic_complete
 
 # Data source for argparse.choices
 food_item_strs = ['Pizza', 'Ham', 'Ham Sandwich', 'Potato']
diff --git a/examples/async_printing.py b/examples/async_printing.py
index 692ce769..a136d8e2 100755
--- a/examples/async_printing.py
+++ b/examples/async_printing.py
@@ -10,7 +10,7 @@ import time
 from typing import List
 
 import cmd2
-from cmd2 import style, fg
+from cmd2 import fg, style
 
 ALERTS = ["Watch as this application prints alerts and updates the prompt",
           "This will only happen when the prompt is present",
diff --git a/examples/basic.py b/examples/basic.py
index 5df3d1b5..2a1e9a12 100755
--- a/examples/basic.py
+++ b/examples/basic.py
@@ -9,7 +9,7 @@
     6) Shell-like capabilities
 """
 import cmd2
-from cmd2 import style, fg, bg
+from cmd2 import bg, fg, style
 
 
 class BasicApp(cmd2.Cmd):
diff --git a/examples/colors.py b/examples/colors.py
index 1466471b..8f8e3c6e 100755
--- a/examples/colors.py
+++ b/examples/colors.py
@@ -26,9 +26,10 @@ Always
 import argparse
 from typing import Any
 
+from colorama import Back, Fore, Style
+
 import cmd2
 from cmd2 import ansi
-from colorama import Fore, Back, Style
 
 
 class CmdLineApp(cmd2.Cmd):
diff --git a/examples/custom_parser.py b/examples/custom_parser.py
index 7c154176..34c7bee2 100644
--- a/examples/custom_parser.py
+++ b/examples/custom_parser.py
@@ -4,8 +4,7 @@ Defines the CustomParser used with override_parser.py example
 """
 import sys
 
-from cmd2 import Cmd2ArgumentParser, set_default_argument_parser
-from cmd2 import ansi
+from cmd2 import Cmd2ArgumentParser, ansi, set_default_argument_parser
 
 
 # First define the parser
diff --git a/examples/exit_code.py b/examples/exit_code.py
index f4b19091..89ed86cd 100755
--- a/examples/exit_code.py
+++ b/examples/exit_code.py
@@ -2,9 +2,10 @@
 # coding=utf-8
 """A simple example demonstrating the following how to emit a non-zero exit code in your cmd2 application.
 """
-import cmd2
 from typing import List
 
+import cmd2
+
 
 class ReplWithExitCode(cmd2.Cmd):
     """ Example cmd2 application where we can specify an exit code when existing."""
diff --git a/examples/hooks.py b/examples/hooks.py
index 409c8979..f8079e58 100755
--- a/examples/hooks.py
+++ b/examples/hooks.py
@@ -10,7 +10,6 @@ follow a command without any intervening whitespace.
 """
 
 import re
-
 from typing import List
 
 import cmd2
diff --git a/examples/initialization.py b/examples/initialization.py
index 609255f1..50bb73aa 100755
--- a/examples/initialization.py
+++ b/examples/initialization.py
@@ -13,7 +13,7 @@
     10) How to make custom attributes settable at runtime
 """
 import cmd2
-from cmd2 import style, fg, bg
+from cmd2 import bg, fg, style
 
 
 class BasicApp(cmd2.Cmd):
diff --git a/examples/migrating.py b/examples/migrating.py
index 3a25b8c8..86a59ed6 100755
--- a/examples/migrating.py
+++ b/examples/migrating.py
@@ -3,9 +3,8 @@
 """
 A sample application for cmd which can be used to show how to migrate to cmd2.
 """
-import random
-
 import cmd
+import random
 
 
 class CmdLineApp(cmd.Cmd):
diff --git a/examples/override_parser.py b/examples/override_parser.py
index eecb0e88..b6548388 100755
--- a/examples/override_parser.py
+++ b/examples/override_parser.py
@@ -10,12 +10,14 @@ The following code shows how to override it with your own parser class.
 # See the code for custom_parser.py. It simply defines a parser and calls cmd2.set_default_argument_parser()
 # with the custom parser's type.
 import argparse
-argparse.cmd2_parser_module = 'examples.custom_parser'
 
 # Next import stuff from cmd2. It will import your module just before the cmd2.Cmd class file is imported
 # and therefore override the parser class it uses on its commands.
 from cmd2 import cmd2
 
+argparse.cmd2_parser_module = 'examples.custom_parser'
+
+
 if __name__ == '__main__':
     import sys
     app = cmd2.Cmd(use_ipython=True, persistent_history_file='cmd2_history.dat')
diff --git a/examples/plumbum_colors.py b/examples/plumbum_colors.py
index 2887ef1f..ed65f245 100755
--- a/examples/plumbum_colors.py
+++ b/examples/plumbum_colors.py
@@ -27,9 +27,10 @@ WARNING: This example requires the plumbum package, which isn't normally require
 """
 import argparse
 
+from plumbum.colors import bg, fg
+
 import cmd2
 from cmd2 import ansi
-from plumbum.colors import fg, bg
 
 
 class FgColors(ansi.ColorBase):
diff --git a/examples/scripts/arg_printer.py b/examples/scripts/arg_printer.py
index 19f6dd3f..f5f30c6d 100755
--- a/examples/scripts/arg_printer.py
+++ b/examples/scripts/arg_printer.py
@@ -2,6 +2,7 @@
 # coding=utf-8
 import os
 import sys
+
 print("Running Python script {!r} which was called with {} arguments".format(os.path.basename(sys.argv[0]),
                                                                              len(sys.argv) - 1))
 for i, arg in enumerate(sys.argv[1:]):
diff --git a/examples/subcommands.py b/examples/subcommands.py
index 4f569b1e..dd69d97e 100755
--- a/examples/subcommands.py
+++ b/examples/subcommands.py
@@ -7,6 +7,7 @@ This example shows an easy way for a single command to have many subcommands, ea
 and provides separate contextual help.
 """
 import argparse
+
 import cmd2
 
 sport_item_strs = ['Bat', 'Basket', 'Basketball', 'Football', 'Space Ball']
diff --git a/examples/unicode_commands.py b/examples/unicode_commands.py
index f8381e50..0a7c5ac7 100755
--- a/examples/unicode_commands.py
+++ b/examples/unicode_commands.py
@@ -3,6 +3,7 @@
 """A simple example demonstrating support for unicode command names.
 """
 import math
+
 import cmd2