如何 return 到以前嵌套的 `while True` 循环？

Question

假设我有这种格式的东西：

while True1:
    if something:
        do some thing
    elif something else:
        do something else
        while True2:
            if something1:
                do some thing1
            if something2:
                do some thing2
            if want to end this while True2 loop
                go back to first while True1 loop
    elif something else else:
        do some thing else else

等等

如何让 while True 循环中的某些内容返回到它嵌套在其中的前一个 while True 循环？

Answer 1

使用break语句。

x = 0
while True:
    x += 1
    if x == 5:
        print(x)
        break

会输出5并退出

Answer 2

break 语句就是这样做的。

while True: #1
    if something:
        do something
    elif something else:
        do something else
        while True: #2
            if something1:
                do something
            if something2:
                do something else
            if want to end this while True #2 loop:
                break            # will break out of the innermost loop only
    elif something else else:
        do some thing else else

阅读更多：Control Flow Tools

如何 return 到以前嵌套的 `while True` 循环？

How to return to previously nested `while True` loops?

python

loops

while-loop

nested-loops

python-3.x