Ronald Oussoren <ronaldousso...@mac.com> added the comment:

This is intentional behaviour, the factory can only be passed as a positional 
argument.

The documentation[1] mentions this, although its probably possible to write 
this a bit clearer.

[1] https://docs.python.org/3.8/library/collections.html#collections.defaultdict

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nosy: +ronaldoussoren

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