BUG: fix calling convention for to_gbq, take 2

Author: jreback

pandas/core/frame.py

@@ -5432,8 +5432,7 @@ def _f():
     return _try_import().to_gbq.__doc__
 
 
-DataFrame.to_gbq = types.MethodType(docstring_wrapper(DataFrame.to_gbq, _f),
-                                    DataFrame)
+DataFrame.to_gbq = docstring_wrapper(DataFrame.to_gbq, _f)
 
 
 def _arrays_to_mgr(arrays, arr_names, index, columns, dtype=None):

pandas/util/decorators.py

@@ -1,5 +1,6 @@
 from pandas.compat import StringIO, callable, signature
 from pandas.lib import cache_readonly  # noqa
+import types
 import sys
 import warnings
 from textwrap import dedent
@@ -259,6 +260,10 @@ def __init__(self, func, creator, default=None):
             self, func, [attr for attr in self._attrs
                          if hasattr(func, attr)])
 
+    def __get__(self, instance, cls=None):
+        # we want to return the actual passed instance
+        return types.MethodType(self, instance)
+
     def __call__(self, *args, **kwargs):
         return self.func(*args, **kwargs)