I’d like to define some contextual functions that can then be used later, as per the example below.

def add(x, y):
    return x + y

def g(x):
    u = my_func(x, 4 ** x)
    return my_func(u, u // 2)

eval('g(1)', globals() | {'my_func': add})

This code throws NameError: name 'my_func' is not defined. Is there any way to achieve this?