dictionary key type confusion isinstance python

I can't understand following execution. I expected different results.

>>> f = {'ms':'ma'}
>>> isinstance(f['ms'], type(str))
False


>>> isinstance(f['ms'], type(dict))
False

>>> type(f['ms'])

Answer

type(str) and type(dict) each return type, so you are checking if your objects are instances of type, which they are not.

If you want to check if something is a string, use

isinstance(f['ms'], str)

not

isinstance(f['ms'], type(str))

And if you want to test if something is a dict, you can use

isinstance(f['ms'], dict)

not

isinstance(f['ms'], type(dict))