[Python-ideas] Alternative Unicode implementations (NSString/NSMutableString)

Victor Stinner victor.stinner at gmail.com
Tue Jul 18 19:40:46 EDT 2017

Supporting a new kind of string storage would require a lot of efforts.
There are a lot of C code specialized for each Unicode kind


Le 19 juil. 2017 12:43 AM, "Jim J. Jewett" <jimjjewett at gmail.com> a écrit :

> Ronald Oussoren came up with a concrete use case for wanting the
> interpreter to consider something a string, even if it isn't
> implemented with the default datastructure.
> In https://mail.python.org/pipermail/python-ideas/2017-July/046407.html
> he writes:
>    The reason I need to subclass str: in PyObjC I use
>    a subclass of str to represent Objective-C strings
>    (NSString/NSMutableString), and I need to keep track
>    of the original value; mostly because there are some
>    Objective-C APIs that use object identity. The worst
>    part is that fully initialising the PyUnicodeObject fields
>    often isn’t necessary as a lot of Objective-C strings
>    aren’t used as strings in Python code.
> The PyUnicodeObject (via its leading PyASCIIObject member) currently
> uses 7 flag bits including 2 for kind.  Would it be worth adding an
> 8th big to indicate that string is a virtual subclass, and that the
> internals should not be touched directly?  (This would require
> changing some of the macros; at the time of PEP 393 it Martin ruled
> YAGNI ... but is this something that might reasonably be reconsidered,
> if someone did the work.  Which I am considering, but not committing
> to.)
> -jJ
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