python3 lambda

1. lambda x: x * i 与 lambda x, i=i: x * i 的区别

def multipliers():
    # 添加了一个默认参数i=i
    return [lambda x: i * x for i in range(4)]

print([m(2) for m in multipliers()])

# [6, 6, 6, 6]

 

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]