suggestion for a small addition to the Python 3 list class
Terry Jan Reedy
tjreedy at udel.edu
Sun Apr 21 21:44:05 EDT 2013
On 4/21/2013 1:12 PM, Lele Gaifax wrote:
> "Robert Yacobellis" <ryacobellis at luc.edu> writes:
>
>> I've noticed that the str join() method takes an iterable,
Specifically, it takes an iterable of strings. Any iterable can be made
such iwth map(str, iterable) or map(repr, iterble).
>> so in the
>> most general case I'm suggesting to add a join() method to every
>> Python-provided iterable (however, for split() vs. join()
.split *could* have been changed in 3.0 to return an iterator rather
than a list, as done with map, filter, and others. An itersplit method
*might* be added in the future.
it would be
>> sufficient to just add a join() method to the list class).
>
> That's the reasoning behind the rejection: to be friendly enough, you'd
> need to include the "join" method in the "sequence protocol", and
> implement it on every "sequence-like" object (be it some kind of
> UserList, or a generator, or an interator...)
Plus, only lists of strings can be joined, not generic lists.
> This question carries several references to the various threads on the
> subject:
>
> http://stackoverflow.com/questions/493819/python-join-why-is-it-string-joinlist-instead-of-list-joinstring
>
> ciao, lele.
>
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