Use of isinstance() can overwrite type
This question already has an answer here:
I think your confusion lies in the fact that type(dict) != dict . Lets discard your example entirely except for the last two lines, which I will use interactive python to present.
>>> type(dict)
<type 'type'>
>>> type(dict())
<type 'dict'>
This is because dict is not a dictionary, but the type of dictionaries. dict() or {} (or {1:2, ...} ) are instances of dictionaries. These instances have type of dict , and satisfy isinstance(___, dict) .
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