remove unused import (#5040)

benjaminp · web-flow · commit e325608740be · 2017-12-28T23:24:40.000-08:00
diff --git a/Lib/lib2to3/patcomp.py b/Lib/lib2to3/patcomp.py
@@ -12,7 +12,6 @@
 
 # Python imports
 import io
-import os
 
 # Fairly local imports
 from .pgen2 import driver, literals, token, tokenize, parse, grammar
