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python の落とし穴 ~lambda編~

Posted at 2022-12-17

落とし穴のコード

def wrap(x, y):
    return x + y


func_ls = [
    lambda x: wrap(x, y)
    for y in [1, 2, 3]
]

for f in func_ls:
    c = f(1)
    print(c)

4
4
4

#　意図通りに動かすには

def wrap(x, y):
    return x + y


func_ls = [
    lambda x, y=y: wrap(x, y)
    for y in [1, 2, 3]
]

for f in func_ls:
    c = f(1)
    print(c)

2
3
4