[Python] typeError: isinstance() arg 2 must be a type or tuple of types >>>

>>> names=['jill','jack']
>>> isinstance(names,list)
Traceback (most recent call last):
File "<pyshell#291>", line 1, in <module>
isinstance(names,list)
TypeError: isinstance() arg 2 must be a type or tuple of types
>>>


Am I missing something here?

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