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Tue Jul 14 20:28:31 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-July/140741.html

The docs for PyRun_String say that both globals and locals should be dictionaries [1].

However, digging into the source [2] shows me that locals doesn’t need to be a dictionary;
it just needs to implement the mapping protocol.  Is it a bad idea to rely on this fact?

(Context: I’m plugging a custom object into locals that uses __getitem__ to track lookups.)

Thanks,
Matt

[1] https://docs.python.org/3.4/c-api/veryhigh.html#c.PyRun_StringFlags
[2] https://github.com/python/cpython/blob/master/Objects/frameobject.c#L628-L629
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[Python-Dev] cpython: locals dictionary in PyRun_String