[Python-Dev] sys.intern should work on bytes

Benjamin Peterson benjamin at python.org
Fri Sep 20 15:57:26 CEST 2013

2013/9/20 Jesus Cea <jcea at jcea.es>:
> Hash: SHA1
> On 20/09/13 15:44, Antoine Pitrou wrote:
>> Yes. The main difference is that sys.intern() will remove the
>> interned strings when every external reference vanishes. It
>> requires either weakref'ability (which both str and bytes lack) or
>> special cooperation from the object destructor (which is why
>> sys.intern() is restricted to str instead of working with arbitrary
>> objects).
> Great comment. Thanks.
> Why str/bytes doesn't support weakrefs, beside memory use?

Is increased memory use for every str/bytes object not a good enough reason?


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