BUG: setitem with Timestamp #2155

Author: changhiskhan

pandas/tseries/index.py

@@ -1255,7 +1255,7 @@ def insert(self, loc, item):
         -------
         new_index : Index
         """
-        if type(item) == datetime:
+        if isinstance(item, datetime):
             item = _to_m8(item)
 
         new_index = np.concatenate((self[:loc].asi8,

pandas/tseries/tests/test_timeseries.py

@@ -320,6 +320,16 @@ def test_frame_fillna_limit(self):
         expected.values[:3] = np.nan
         tm.assert_frame_equal(result, expected)
 
+    def test_frame_setitem_timestamp(self):
+        #2155
+        columns = DatetimeIndex(start='1/1/2012', end='2/1/2012',
+                                freq=datetools.bday)
+        index = range(10)
+        data = DataFrame(columns=columns, index=index)
+        t = datetime(2012, 11, 1)
+        ts = Timestamp(t)
+        data[ts] = np.nan #works
+
     def test_sparse_series_fillna_limit(self):
         index = np.arange(10)
         s = Series(np.random.randn(10), index=index)