目录

第七章、函数基础之函数嵌套

一、函数的嵌套定义

函数内部定义的函数，无法在函数调用内部定义的函数

def f1():    def f2():        print('from f2')    f2()

f2()  # NameError: name 'f2' is not defineddef f1():    def f2():        print('from f2')    f2()f1()

from f2

二、函数的嵌套的调用

def max2(x, y):    if x > y:        return x    else:        return ydef max4(a, b, c, d):    res1 = max2(a, b)    res2 = max2(res1, c)    res3 = max2(res2, d)    return res3print(max4(1, 2, 3, 4))

三、练习

from math import pidef circle(radius, action='area'):    def area():        return pi * (radius**2)    def perimeter():        return 2*pi*radius    if action == 'area':        return area()    else:        return perimeter()print(f"circle(10): {circle(10)}")print(f"circle(10,action='perimeter'): {circle(10,action='perimeter')}")

circle(10): 314.1592653589793 circle(10,action='perimeter'): 62.83185307179586