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[Python] return A [or / and] B

Last updated at Posted at 2015-05-12

return A or B ?

先日、こんなコードを見かけて混乱しました。

def hoge:(self)
    return A or B

return構文内でのorやandは初めて見たので、調べてみます。

なに?

公式ドキュメントからの引用

The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned.
The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and the resulting value is returned.

書かないと分からぬ。

or_and_in_return.py
def and_in_return1():
    return 1 == 1 and 1 == 1

def and_in_return2():
    return 1 == 0 and 1 == 1

def and_in_return3():
    return 1 == 1 and 1 == 0

print(and_in_return1()) # True
print(and_in_return2()) # False
print(and_in_return3()) # False

def or_in_return1():
    return 1 == 1 or 1 == 1

def or_in_return2():
    return 1 == 0 or 1 == 0

def or_in_return3():
    return 1 == 1 or 1 == 0

print(or_in_return1()) # True
print(or_in_return2()) # False
print(or_in_return3()) # True

if内で使われている作用と変わりませんでしたね…

参考にさせて頂いたページ

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