[Python] In Python, how do I get the list of classes defined within a particular file?

If a file myfile.py contains:

class A(object):
# Some implementation

class B (object):
# Some implementation


How can I define a method so that, given myfile.py, it returns [A, B]?

Here, the returned values for A and B can be either the name of the classes or the type of the classes.

(i.e. type(A) = type(str) or type(A) = type(type))

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