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Python 気持ちが悪い、引数への値の渡し方

Last updated at Posted at 2023-01-27

下のコードにおいて、「気持ちが悪い」とコメントしたところ。ちゃんと動くが、気持ちが悪い。

def func(a, b, c=3, d=4):
    print(a, b, c, d)

# OK
func(1, 2)
# 1 2 3 4

# OK
func(1, 2, c=-1, d=5)
# 1 2 -1 5

# OK
func(1, 2, d=5, c=-1)
# 1 2 -1 5

# 気持ちが悪い
func(1, 2, -1)
# 1 2 -1 4

# 気持ちが悪い
func(1, 2, -1, 5)
# 1 2 -1 5

# 気持ちが悪い
func(a=1, b=2)
# 1 2 3 4

# 気持ちが悪い
func(b=2, a=1)
# 1 2 3 4

# 気持ちが悪い
func(c=-1, b=2, a=1)
# 1 2 -1 4

一応、下のようにすれば、「気持ちが悪い」のパターンでerrorを発生させることができるらしい。

def func2(a, b, /, * , c=3, d=4):
    print(a, b, c, d)

# OK
func2(1, 2)
# 1 2 3 4

# 気持ちが悪い
func2(c=-1, b=2, a=1)
# TypeError: func() got some positional-only arguments passed as keyword arguments: 'a, b'

参考:https://docs.python.org/ja/3.8/whatsnew/3.8.html

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