CLN: eliminate bootstrapping issue form generate_code.py

Author: y-p

pandas/src/generate_code.py

@@ -1,5 +1,8 @@
 from __future__ import print_function
-from pandas.compat import range, cStringIO as StringIO
+# we only need to be able to run this file on 2.7
+# don't introduce a pandas/pandas.compat import
+# or we get a bootstrapping problem
+from StringIO import StringIO
 import os
 
 header = """