Merge #640

640: Deprecation warning for python3.6 r=pathunstrom a=MichaelCduBois

This is the feature for #636 

If the user is running Python 3.6 a deprecation warning is logged.

Co-authored-by: Michael duBois <mdubois@bytement.com>
Co-authored-by: Michael duBois <39778093+MichaelCduBois@users.noreply.github.com>
Co-authored-by: Piper Thunstrom <pathunstrom@gmail.com>

CONTRIBUTORS.md

@@ -50,6 +50,6 @@ Halle Jones|HJones@aliacy.com||
 [Victor Hart](https://github.com/vicohart) | [vicohart@gmail.com](vicohart@gmail.com) |
 [nilamo](https://github.com/nilamo) | [7nilamo@gmail.com](7nilamo@gmail.com) | 
 [Abhijeet](https://github.com/abhijeetgupto) |[abhigupta7b@gmail.com](abhigupta7b@gmail.com) | [@abhijeetgupto](https://twitter.com/abhijeetgupto)|
+[Michael duBois](https://github.com/MichaelCduBois) |  | 
 [Stephen James](https://github.com/sjames1958gm) | [sajames1958@gmail.com](sajames1958@gmail.com) |
 [Sergio Gavilán](https://github.com/sgavil) | [ssjsrgx@gmail.com](ssjsrgx@gmail.com) | [@sgavil01](https://twitter.com/sgavil01)
-

ppb/__init__.py

@@ -30,6 +30,7 @@
 """
 
 import logging
+from sys import version_info
 from typing import Callable
 
 from ppb import directions
@@ -73,6 +74,30 @@ def _make_kwargs(setup, title, engine_opts):
     return kwargs
 
 
+def _validate_python_support(required_version='3.7', ppb_release='2.0',
+                             release_date='June 2022'):
+    """
+    Verifies Supported Python Version.
+
+    This function verifies ppb is running on a supported Python version.
+
+    :param required_version: Minimum Python Version Supported by PPB
+    :type required_version: str
+    :param ppb_release: PPB release version deprecation will occur
+    :type ppb_release: str
+    :param release_date: Estimated release month for PPB Version
+    :type release_date: str
+    """
+    # Creates (Major, Minor) version tuples for comparisson
+    if version_info[0:2] <= tuple(map(int, required_version.split('.'))):
+        deprecation_message = f"PPB v{ppb_release} will no longer support "\
+                              f"Python {version_info[0]}.{version_info[1]} " \
+                              f"once released around {release_date}. Please " \
+                              f"update to Python {required_version} or newer."
+        warnings.filterwarnings('default')
+        warnings.warn(deprecation_message, DeprecationWarning)
+
+
 def run(setup: Callable[[Scene], None] = None, *, log_level=logging.WARNING,
         starting_scene=Scene, title="PursuedPyBear", **engine_opts):
     """
@@ -122,6 +147,8 @@ def __init__(self, **kwargs):
     """
     logging.basicConfig(level=log_level)
 
+    _validate_python_support()
+
     with make_engine(setup, starting_scene=starting_scene, title=title, **engine_opts) as eng:
         eng.run()