8000 ENH: #9847, adding a "same" and "expand" param to StringMethods.split() by sreejata · Pull Request #9870 · pandas-dev/pandas · GitHub
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ENH: #9847, adding a "same" and "expand" param to StringMethods.split() #9870

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ENH: #9847, adding a "same" and "expand" param to StringMethods.split() #9870

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38f96dd
Fix: #9847 by adding a "same" and "expand" param to the StringMethods…
Apr 13, 2015
4ede22a
Cleaning up
Apr 13, 2015
df4d0ee
Merge pull request #1 from sreejata/master
sreejata Apr 13, 2015
c8f14dd
Adding a future deprecation warning
Apr 13, 2015
612e0c0
Merge pull request #2 from sreejata/master
sreejata Apr 13, 2015
d2c57da
Adding doc string
Apr 13, 2015
a5e1084
Merge pull request #3 from sreejata/master
sreejata Apr 13, 2015
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Cleaning up
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sreejata authored and sreejata committed Apr 13, 2015
commit 4ede22a155ae196188c24e5d816e399b2894abf7
4 changes: 2 additions & 2 deletions pandas/core/strings.py
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Expand Up @@ -651,7 +651,7 @@ def str_split(arr, pat=None, n=None, return_type='series'):

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this is a minor point but it might be good idea to use a dict to organize the mapping from old to new arg names, at the beginning of the function, something like:

arg_map = {'series': 'same', 'index': 'same', 'frame': 'expand'}
if return_type in arg_map:
    warnings.warn("return_type='%s' is deprecated, please use '%s' instead" % (return_type, arg_map[return_type]), FutureWarning)
    return_type = arg_map[return_type]

this way the rest of the code doesn't have to contain references to the old names, making it easier to remove the deprecation stuff later.

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Should this be updated to use expand=True/False or keep as same/expand?

if return_type not in ('series', 'index', 'frame', 'same', 'expand'):
raise ValueError("return_type must be {'series', 'index', 'frame', 'same', 'expand'}")
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also, here I would only mention 'same' and 'expand'

if return_type in ['frame', 'expand'] and isinstance(arr, Index):
if return_type in ('frame', 'expand') and isinstance(arr, Index):
raise ValueError("return_type='frame' is not supported for string "
"methods on Index")
if pat is None:
Expand All @@ -668,7 +668,7 @@ def str_split(arr, pat=None, n=None, return_type='series'):
n = 0
regex = re.compile(pat)
f = lambda x: regex.split(x, maxsplit=n)
if return_type == 'frame' or return_type == 'expand':
if return_type in ('frame', 'expand'):
res = DataFrame((Series(x) for x in _na_map(f, arr)), index=arr.index)
else:
res = _na_map(f, arr)
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