Merge pull request #8461 from jreback/applymap

BUG: fix applymap to handle Timedelta

Author: jreback

pandas/core/frame.py

@@ -3652,8 +3652,9 @@ def applymap(self, func):
 
         # if we have a dtype == 'M8[ns]', provide boxed values
         def infer(x):
-            if com.is_datetime64_dtype(x):
-                x = lib.map_infer(_values_from_object(x), lib.Timestamp)
+            if com.needs_i8_conversion(x):
+                f = com.i8_boxer(x)
+                x = lib.map_infer(_values_from_object(x), f)
             return lib.map_infer(_values_from_object(x), func)
         return self.apply(infer)
 

pandas/tests/test_frame.py

@@ -10117,6 +10117,13 @@ def test_applymap(self):
         result = df.applymap(str)
         assert_frame_equal(result,expected)
 
+        # datetime/timedelta
+        df['datetime'] = Timestamp('20130101')
+        df['timedelta'] = Timedelta('1 min')
+        result = df.applymap(str)
+        for f in ['datetime','timedelta']:
+            self.assertEquals(result.loc[0,f],str(df.loc[0,f]))
+
     def test_filter(self):
         # items
         filtered = self.frame.filter(['A', 'B', 'E'])