Check the minimum supported Python version and raise an exception if an older

Python version is being used.

Author: anthony-tuininga

setup.py

@@ -12,6 +12,10 @@
 import os
 import sys
 
+# check minimum supported Python version
+if sys.version_info[:2] < (3, 5):
+    raise Exception("Python 3.5 or higher is required.")
+
 # if setuptools is detected, use it to add support for eggs
 try:
     from setuptools import setup, Extension