BUG: fix to_gbq calling convention; now its a bound method of DataFrame

xref pandas-dev#15484

Author: jreback

pandas/core/frame.py

@@ -942,11 +942,6 @@ def to_gbq(self, destination_table, project_id, chunksize=10000,
                           chunksize=chunksize, verbose=verbose, reauth=reauth,
                           if_exists=if_exists, private_key=private_key)
 
-    def _f():
-        from pandas.io.gbq import _try_import
-        return _try_import().to_gbq.__doc__
-    to_gbq = docstring_wrapper(to_gbq, _f)
-
     @classmethod
     def from_records(cls, data, index=None, exclude=None, columns=None,
                      coerce_float=False, nrows=None):
@@ -5430,6 +5425,17 @@ def combineMult(self, other):
 _EMPTY_SERIES = Series([])
 
 
+# patch in the doc-string for to_gbq
+# and bind this method
+def _f():
+    from pandas.io.gbq import _try_import
+    return _try_import().to_gbq.__doc__
+
+
+DataFrame.to_gbq = types.MethodType(docstring_wrapper(DataFrame.to_gbq, _f),
+                                    DataFrame)
+
+
 def _arrays_to_mgr(arrays, arr_names, index, columns, dtype=None):
     """
     Segregate Series based on type and coerce into matrices.

pandas/util/decorators.py

@@ -259,7 +259,7 @@ def __init__(self, func, creator, default=None):
             self, func, [attr for attr in self._attrs
                          if hasattr(func, attr)])
 
-    def __call__(self, func, *args, **kwargs):
+    def __call__(self, *args, **kwargs):
         return self.func(*args, **kwargs)
 
     @property