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Mon Feb 12 21:29:37 CET 2007 · https://mail.python.org/pipermail/python-dev/2007-February/070988.html

Hrvoje Nikšic <hrvoje.niksic at avl.com> wrote:
> 
> I propose modifying PyString_InternInPlace to better cope with string
> subtype instances.

Any particular reason why the following won't work for you?

_interned = {}

def intern(st):
    #add optional type checking here
    if st not in _interned:
        _interned[st] = st
    return _interned[st]

If I remember the implementation of intern correctly, that's more or
less what happens under the covers.

 - Josiah

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