[issue30040] new empty dict can be more small

[R. David Murray]

R. David Murray added the comment:

I've worked on an application (proprietary, unfortunately) that created a lot of empty dictionaries that only sometimes got populated.  It involved sqlalchemy, but I don't remember if the dicts came from sqlalchemy itself or from the code that used it.  That application did care about memory, and the shared-key dicts were a big benefit to it.

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nosy: +r.david.murray

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<http://bugs.python.org/issue30040>
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