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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
Merged

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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Review (jreback)
h-vetinari Nov 3, 2018
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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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9 changes: 4 additions & 5 deletions pandas/core/strings.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2051,7 +2051,7 @@ def _get_series_list(self, others, ignore_index=False):
return ([Series(others, index=idx)], False)
raise TypeError(err_msg)

def cat(self, others=None, sep=None, na_rep=None, join=None):
def cat(self, others=None, sep='', na_rep=None, join=None):
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there is likely some other check for sep is None in the codebase, this shouldn't pass, and as I said pls change back to the original modulo the doc-string.

"""
Concatenate strings in the Series/Index with given separator.

Expand All @@ -2074,8 +2074,9 @@ def cat(self, others=None, sep=None, na_rep=None, join=None):

If others is None, the method returns the concatenation of all
strings in the calling Series/Index.
sep : string or None, default None
If None, concatenates without any separator.
sep : string, default ''
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string --> str; iirc when specifying parameter types we want to use the Python function name (e.g. bool instead of boolean, dict instead of dictionary, etc.). Can you also modify na_rep a couple lines below?

The separator between the different elements/columns. By default
the empty string `''` is used.
na_rep : string or None, default None
Representation that is inserted for all missing values:

Expand Down Expand Up @@ -2196,8 +2197,6 @@ def cat(self, others=None, sep=None, 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:
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I think just adding the doc-string update is enough. we commondly accept none, then actuall do this check here. The reason is if you actually pass None your change will fail (pls add a test to check that)

sep = ''

if isinstance(self._orig, Index):
data = Series(self._orig, index=self._orig)
Expand Down