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Series methods isnull and notnull #209

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Series methods isnull and notnull #209

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fcbe927
Add isnull and notnull methods to Series.
takluyver Oct 9, 2011
1bc9893
Add trove classifiers for Python 3 compatibility.
takluyver Oct 9, 2011
0860ebe
Fix bug writing Series to CSV in Python 3.
takluyver Oct 9, 2011
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5 changes: 4 additions & 1 deletion pandas/core/series.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1603,7 +1603,7 @@ def to_csv(self, path):
path : string or None
Output filepath. If None, write to stdout
"""
f = open(path, 'wb')
f = open(path, 'w')
csvout = csv.writer(f)
csvout.writerows(self.iteritems())
f.close()
Expand All @@ -1619,6 +1619,9 @@ def dropna(self):
return remove_na(self)

valid = dropna

isnull = isnull
notnull = notnull

def first_valid_index(self):
"""
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12 changes: 12 additions & 0 deletions pandas/tests/test_series.py
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Expand Up @@ -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)
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2 changes: 2 additions & 0 deletions setup.py
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Expand Up @@ -113,6 +113,8 @@
'Operating System :: OS Independent',
'Intended Audience :: Science/Research',
'Programming Language :: Python',
'Programming Language :: Python :: 2',
'Programming Language :: Python :: 3',
'Programming Language :: Cython',
'Topic :: Scientific/Engineering',
]
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