xref #9667 Now we also have string methods available on the index, the possible options for return_type ('series', 'frame') are a bit confusing I think: it will be confusing for users to get a Index back even if he/she supplies return_type='series' on a Index.str.split, or to get a series back with Series.str.split(.., return_type='index')?
Possible ways to make this a better API:
An expand keyword (or another name), that indicates for False: give same dimension back (so for series/index keep it a series/index), and for True: expand series to dataframe.
This would then be a duplicate for return_type of course. But the return_type was only introduced in 0.15.1 (and for partition it is still in a PR), so if we want to change this: better now than later. Or has this ship sailed?
easier solution of @jreback: return_type='same'|'expand' to satisfy this need? (and can be easily back-compat) -> so no need to change the name of the keyword, only the arguments.
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