update windows build to Python 3.7

Lib/lib2to3/fixes/fix_standarderror.py

@@ -0,0 +1,18 @@
+# Copyright 2007 Google, Inc. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer for StandardError -> Exception."""
+
+# Local imports
+from .. import fixer_base
+from ..fixer_util import Name
+
+
+class FixStandarderror(fixer_base.BaseFix):
+    BM_compatible = True
+    PATTERN = """
+              'StandardError'
+              """
+
+    def transform(self, node, results):
+        return Name("Exception", prefix=node.prefix)