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DOC: fix return type of str.extract #22562

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Merged
merged 2 commits into from
Sep 3, 2018
Merged

DOC: fix return type of str.extract #22562

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bfeacbb
DOC: fix return type of str.extract
zhujun98 Sep 1, 2018
acd9147
DOC: a few minor improvements for str.extract
zhujun98 Sep 2, 2018
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21 changes: 12 additions & 9 deletions pandas/core/strings.py
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Original file line number Diff line number Diff line change
Expand Up @@ -854,8 +854,9 @@ def str_extract(arr, pat, flags=0, expand=True):
pat : string
Regular expression pattern with capturing groups.
flags : int, default 0 (no flags)
``re`` module flags, e.g. ``re.IGNORECASE``.
See :mod:`re`
Flags from the ``re`` module, e.g. ``re.IGNORECASE``, that
modify regular expression matching for things like case,
spaces, etc. For more details, see :mod:`re`.
expand : bool, default True
If True, return DataFrame with one column per capture group.
If False, return a Series/Index if there is one capture group
Expand All @@ -865,13 +866,15 @@ def str_extract(arr, pat, flags=0, expand=True):

Returns
-------
DataFrame with one row for each subject string, and one column for
each group. Any capture group names in regular expression pat will
be used for column names; otherwise capture group numbers will be
used. The dtype of each result column is always object, even when
no match is found. If expand=False and pat has only one capture group,
then return a Series (if subject is a Series) or Index (if subject
is an Index).
DataFrame or Series or Index
A DataFrame with one row for each subject string, and one
column for each group. Any capture group names in regular
expression pat will be used for column names; otherwise
capture group numbers will be used. The dtype of each result
column is always object, even when no match is found. If
``expand=False`` and pat has only one capture group, then
return a Series (if subject is a Series) or Index (if subject
is an Index).

See Also
--------
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