None Python error/bug?

Question

In Python you have the None singleton, which acts pretty oddly in certain circumstances:

>>> a = None
>>> type(a)


        

Answer 1

You can try:

>>> variable = None
>>> isinstance(variable,type(None))
True
>>> variable = True
>>> isinstance(variable,type(None))
False

isinstance takes 2 arguments isinstance(object, classinfo) Here, by passing None you are setting classinfo to None, hence the error. You need pass in the type.