ENH #4163 Fixed missing basestring import for py3.3 compat

ENH #4163 Fixed missing string_types import for py3.3 compat

Author: mangecoeur

pandas/io/sql.py

@@ -5,7 +5,7 @@
 from __future__ import print_function
 from datetime import datetime, date
 import warnings
-from pandas.compat import range, lzip, map, zip, raise_with_traceback
+from pandas.compat import lzip, map, zip, raise_with_traceback, string_types
 import numpy as np
 
 
@@ -444,7 +444,7 @@ def _index_name(self, index):
                 return _safe_col_name(self.frame.index.name)
             else:
                 return self.prefix + '_index'
-        elif isinstance(index, basestring):
+        elif isinstance(index, string_types):
             return index
         else:
             return None