python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/reindent-rst.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+# Make a reST file compliant to our pre-commit hook.
+# Currently just remove trailing whitespace.
+
+import sys
+
+import patchcheck
+
+def main(argv=sys.argv):
+    patchcheck.normalize_docs_whitespace(argv[1:])
+
+if __name__ == '__main__':
+    sys.exit(main())