BUG: Check for size != 0 before trying to insert pandas-dev#10193

Author: rekcahpassyla

pandas/tests/test_series.py

@@ -1439,6 +1439,16 @@ def test_setitem(self):
         expected = self.series.append(Series([1],index=['foobar']))
         assert_series_equal(s,expected)
 
+        # Test for issue #10193
+        series = pd.TimeSeries()
+        series[pd.datetime(2012, 1, 1)] = 47
+        expected = pd.TimeSeries(47, [pd.datetime(2012, 1, 1)])
+        assert_series_equal(series, expected)
+
+        series = pd.TimeSeries(0, pd.date_range('2011-01-01', '2011-01-01'))[:0]
+        series[pd.datetime(2012, 1, 1)] = 47
+        assert_series_equal(series, expected)
+
     def test_setitem_dtypes(self):
 
         # change dtypes

pandas/tseries/index.py

@@ -1521,7 +1521,7 @@ def insert(self, loc, item):
             if zone != izone:
                 raise ValueError('Passed item and index have different timezone')
             # check freq can be preserved on edge cases
-            if self.freq is not None:
+            if self.size and self.freq is not None:
                 if (loc == 0 or loc == -len(self)) and item + self.freq == self[0]:
                     freq = self.freq
                 elif (loc == len(self)) and item - self.freq == self[-1]: