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__) print(fib1.__code__.co_consts) print(fib1.__code__.co_names) print(fib1.__code__.co_code) dis.dis(fib1)