Replace closure variables in Python (stupid)

replace_closure_variables.py

def foo(): 
    x = 42 
    def f(): 
        return x 
    return f 

f = foo()
f()   # 42

def replace_closure_variables(func, **kwargs): 
    variable_names = func.__code__.co_freevars 
    cells = func.__closure__ 
    for k, v in kwargs.items(): 
        pos = variable_names.index(k) 
        cells[pos].cell_contents = v

replace_closure_variables(f, x=200)
f()  # 200
replace_closure_variables(f, x=123)
f()  # 123