python - While/Else 重新检查条件并循环

Question

我有以下代码:

def check(onen,twon,threen,fourn,fiven):
while ((onen != twon) and (onen != threen) and (onen != fourn) and (onen != fiven)):
    return onen
else:
    onen = random.randint(1,45)

想问一下怎么做成这样:

def check(onen,twon,threen,fourn,fiven):
while ((onen != twon) and (onen != threen) and (onen != fourn) and (onen != fiven)):
    return onen
else:
    onen = random.randint(1,45)
        (check the condition on while again)

我想做这个循环:如果条件为假，检查并再次检查，直到它为真。

Answer 1

看来你把它弄反了。试试这个:

while not condition:
    change condition
return that

对于您的具体示例:

def check(onen, twon, threen, fourn, fiven):
    while not ((onen != twon) and (onen != threen) and (onen != fourn) and (onen != fiven)):
        onen = random.randint(1,45)
    return onen

或更短:

def check(onen, twon, threen, fourn, fiven):
    while onen in (twon, threen, fourn, fiven):
        onen = random.randint(1,45)
    return onen

或者更更短，没有循环(不过只适用于小范围):

def check(onen, twon, threen, fourn, fiven):
    return random.choice([x for x in range(1, 46) 
                          if x not in (twon, threen, fourn, fiven)])

但是请注意，这些都不会在函数外更改 onen 的值(当然，除非您执行 onen = check(...)).