New submission from Jim Fasarakis-Hilliard <d.f.hilli...@gmail.com>:

This isn't an issue, `value` (that is, `{}` here) is shared among all keys. 
Since you've added a mutable value, when you mutate it this change is seen for 
all keys holding the value. 

This is documented in dict.fromkeys 
https://docs.python.org/3/library/stdtypes.html#dict.fromkeys

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nosy: +Jim Fasarakis-Hilliard

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40852>
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