8000 API: change default for sep in str.cat (in docstring) by h-vetinari · Pull Request #23443 · pandas-dev/pandas · GitHub
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API: change default for sep in str.cat (in docstring) #23443

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Merged
merged 11 commits into from
Nov 6, 2018
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API: change default for sep in str.cat (in docstring) #23443

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API: change default for sep in str.cat
h-vetinari Nov 1, 2018
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Merge remote-tracking branch 'upstream/master' into str_cat_sep
h-vetinari Nov 2, 2018
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h-vetinari Nov 2, 2018
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h-vetinari Nov 2, 2018
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Merge remote-tracking branch 'upstream/master' into str_cat_sep
h-vetinari Nov 3, 2018
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h-vetinari Nov 3, 2018
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h-vetinari Nov 5, 2018
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Review (jschendel & jreback)
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@h-vetinari
h-vetinari committed Nov 2, 2018
commit d361dceeba1ac28f372bc5157de97718cda69290
10 changes: 8 additions & 2 deletions pandas/core/strings.py
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Expand Up @@ -2074,10 +2074,10 @@ def cat(self, others=None, sep='', na_rep=None, join=None):

If others is None, the method returns the concatenation of all
strings in the calling Series/Index.
sep : string, default ''
sep : str, default ''
The separator between the different elements/columns. By default
the empty string `''` is used.
na_rep : string or None, default None
na_rep : str or None, default None
Representation that is inserted for all missing values:

- If `na_rep` is None, and `others` is None, missing values in the
Expand Down Expand Up @@ -2197,6 +2197,12 @@ def cat(self, others=None, sep='', na_rep=None, join=None):

if isinstance(others, compat.string_types):
raise ValueError("Did you mean to supply a `sep` keyword?")
if sep is None:
warnings.warn('Passing `sep=None` to .str.cat is deprecated and '
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pls remove this and just update as I suggested.

'will be removed in a future version. Please use '
'`sep=''` to pass the default explicitly',
FutureWarning, stacklevel=2)
sep = ''

if isinstance(self._orig, Index):
data = Series(self._orig, index=self._orig)
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5 changes: 5 additions & 0 deletions pandas/tests/test_strings.py
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Expand Up @@ -162,6 +162,11 @@ def test_str_cat_raises_intuitive_error(self, box):
with tm.assert_raises_regex(ValueError, message):
s.str.cat(' ')

# GH 23443
with tm.assert_produces_warning(expected_warning=FutureWarning):
# FutureWarning to switch to default sep='' (instead of None)
s.str.cat(sep=None)

@pytest.mark.parametrize('dtype_target', ['object', 'category'])
@pytest.mark.parametrize('dtype_caller', ['object', 'category'])
@pytest.mark.parametrize('box', [Series, Index])
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