"是"或"是" - 期望未得到满足

Question

在下面的代码中,answer()按预期工作,如果输入为"y" answer2()则返回true,否则返回false,但是,它总是返回true.

有人可以解释为什么会这样吗？

def answer():
    answer = raw_input()
    if answer == "y":
        return True
    else:
        return False


def answer2():
    answer = raw_input()
    if answer == "y" or "yes":  # <- notice the extra: or "yes"
        return True
    else:
        return False


if answer() == True:
    print "true"
else:
    print "false"


if answer2() == True:
    print "true"
else:
    print "false"

Answer 1

表达式,"y" or "yes"将评估为"y".你想要的是:

if answer in ('y', 'yes'):
    return True

Answer 2

我不是Python专家,但我怀疑它应该是:

if answer == "y" or answer == "yes":  # <- notice the extra: or "yes"

换句话说,我怀疑它目前正在将其解析为:

if (answer == "y") or ("yes")

并且只是将"是"转换为True,实际上......这就是为什么它总是返回True.