Python: is there a way to list all the functions defined inside a function?

Question

Consider a function that contains definitions of some other functions. Is there a way to list all the functions defined inside a function?

For example, if there is a function f defined as below, how can I list all the functions defined within f?

def f(x):
    def g(y):
        return y

    def h(z):
        return z

    return x