Add isnull and notnull methods to Series.

Closes gh-203
pandas-dev · Oct 9, 2011 · 32017fa · 32017fa
1 parent 47ddcfc
commit 32017fa
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diff --git a/pandas/core/series.py b/pandas/core/series.py
@@ -1619,6 +1619,9 @@ def dropna(self):
         return remove_na(self)
 
     valid = dropna
+
+    isnull = isnull
+    notnull = notnull
 
     def first_valid_index(self):
         """

diff --git a/pandas/tests/test_series.py b/pandas/tests/test_series.py
@@ -824,6 +824,18 @@ def test_valid(self):
         self.assertEqual(len(result), ts.count())
 
         common.assert_dict_equal(result, ts, compare_keys=False)
+
+    def test_isnull(self):
+        ser = Series([0,5.4,3,nan,-0.001])
+        assert_series_equal(ser.isnull(), Series([False,False,False,True,False]))
+        ser = Series(["hi","",nan])
+        assert_series_equal(ser.isnull(), Series([False,False,True]))
+
+    def test_notnull(self):
+        ser = Series([0,5.4,3,nan,-0.001])
+        assert_series_equal(ser.notnull(), Series([True,True,True,False,True]))
+        ser = Series(["hi","",nan])
+        assert_series_equal(ser.notnull(), Series([True,True,False]))
 
     def test_shift(self):
         shifted = self.ts.shift(1)