def multipliers(): return [lambda x: i * x for i in range(4)] print([m(2) for m in multipliers()]) # [6, 6, 6, 6]
multipliers内嵌套了一个匿名函数
该匿名函数引用外部非全局变量i
返回该嵌套函数
def multipliers(): # 添加了一个默认参数i=i return [lambda x, i=i: i * x for i in range(4)] print([m(2) for m in multipliers()]) # [0, 2, 4, 6]