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BUG: Bug in pd.read_msgpack with inferring a DateTimeIndex frequency incorrectly (GH5947) #5948

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Merged
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Jan 15, 2014
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BUG: Bug in pd.read_msgpack with inferring a DateTimeIndex frequency incorrectly (GH5947) #5948

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2 changes: 2 additions & 0 deletions doc/source/release.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,8 @@ Bug Fixes
- ``pd.match`` not returning passed sentinel
- ``Panel.to_frame()`` no longer fails when ``major_axis`` is a
``MultiIndex`` (:issue:`5402`).
- Bug in ``pd.read_msgpack`` with inferring a ``DateTimeIndex`` frequencey
incorrectly (:issue:`5947`)

pandas 0.13.0
-------------
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9 changes: 5 additions & 4 deletions pandas/io/packers.py
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Expand Up @@ -458,18 +458,19 @@ def decode(obj):
return globals()[obj['klass']].from_tuples(data, names=obj['names'])
elif typ == 'period_index':
data = unconvert(obj['data'], np.int64, obj.get('compress'))
return globals()[obj['klass']](data, name=obj['name'],
freq=obj['freq'])
d = dict(name=obj['name'], freq=obj['freq'])
return globals()[obj['klass']](data, **d)
elif typ == 'datetime_index':
data = unconvert(obj['data'], np.int64, obj.get('compress'))
result = globals()[obj['klass']](data, freq=obj['freq'],
name=obj['name'])
d = dict(name=obj['name'], freq=obj['freq'], verify_integrity=False)
result = globals()[obj['klass']](data, **d)
tz = obj['tz']

# reverse tz conversion
if tz is not None:
result = result.tz_localize('UTC').tz_convert(tz)
return result

elif typ == 'series':
dtype = dtype_for(obj['dtype'])
index = obj['index']
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11 changes: 11 additions & 0 deletions pandas/io/tests/test_packers.py
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Expand Up @@ -372,6 +372,17 @@ def test_iterator(self):
for i, packed in enumerate(read_msgpack(path, iterator=True)):
check_arbitrary(packed, l[i])

def tests_datetimeindex_freq_issue(self):

# GH 5947
# inferring freq on the datetimeindex
df = DataFrame([1, 2, 3], index=date_range('1/1/2013', '1/3/2013'))
result = self.encode_decode(df)
assert_frame_equal(result, df)

df = DataFrame([1, 2], index=date_range('1/1/2013', '1/2/2013'))
result = self.encode_decode(df)
assert_frame_equal(result, df)

class TestSparse(TestPackers):

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