import dis def fib1(n): if n < 2: return n current, next = 0,1 while n: current, next = next, current + next n -= 1 return current print(fib1.__code__) # the address of the function print(fib1.__code__.co_consts) # return tuple, constant, first print(fib1.__code__.co_names) ## all the local variable names, print(fib1.__code__.co_code) # actual bye code dis.dis(fib1)