Add an exception at install for python < 3.6.2 (#5171)

* Add an exception for python < 3.6.2

See #5065 for reasoning

Co-authored-by: Marc Mueller <[email protected]>

Author: Pierre-Sassoulas

Diff for: setup.py

@@ -1,3 +1,20 @@
+import sys
+
 from setuptools import setup
 
+
+class PylintIncompatiblePythonError(Exception):
+    def __init__(self) -> None:
+        super().__init__(
+            "The last version compatible with Python <= 3.6.2 is pylint '2.9.3'. "
+            f"You're using {'.'.join([str(v) for v in sys.version_info[:3]])}. "
+            "Please install pylint 2.9.3 explicitly or upgrade your python interpreter "
+            "to at least 3.6.2. Remember that Python 3.6 end life is December 2021. "
+            "See https://github.com/PyCQA/pylint/issues/5065 for more detail."
+        )
+
+
+if sys.version_info < (3, 6, 2):
+    raise PylintIncompatiblePythonError()
+
 setup()