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ENH: Have inferred_freq set offset. Have freq always try to infer. #6637

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ENH: Have inferred_freq set offset. Have freq always try to infer. #6637

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27e79af
ENH: Have inferred_freq set offset
jseabold Mar 14, 2014
40044dc
ENH: index.freq always tries to infer frequency
jseabold Mar 14, 2014
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1 change: 1 addition & 0 deletions doc/source/v0.14.0.txt
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Expand Up @@ -330,6 +330,7 @@ Enhancements
and data_label which allow the time stamp and dataset label to be set when creating a
file. (:issue:`6545`)
- ``pandas.io.gbq`` now handles reading unicode strings properly. (:issue:`5940`)
- For a DatetimeIndex ``freq`` always tries to infer a frequency. If it is possible to infer the frequency, viewing the ``inferred_freq`` property of a DatetimeIndex will now also set the offset and freq property as a side effect.

Performance
~~~~~~~~~~~
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7 changes: 6 additions & 1 deletion pandas/tseries/index.py
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Expand Up @@ -1421,12 +1421,17 @@ def map(self, f):
@property
def freq(self):
""" return the frequency object if its set, otherwise None """
offset = self.offset
if offset is None:
_ = self.inferred_freq
return self.offset

@cache_readonly
def inferred_freq(self):
try:
return infer_freq(self)
freq = infer_freq(self)
self.offset = to_offset(freq)
return freq
except ValueError:
return None

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