BUG: type aliasing is not allowed to be compared using isinstance()

Author: adamabk

pandas/compat/__init__.py

@@ -425,7 +425,7 @@ def raise_with_traceback(exc, traceback=Ellipsis):
 
 # In Python 3.7, the private re._pattern_type is removed.
 # Python 3.5+ have typing.re.Pattern
-if PY35:
+if sys.version_info >= (3, 5, 4):
     import typing
     re_type = typing.re.Pattern
 else: