在 Python 3 中不使用“break"就停止迭代

2022-01-24 00:00:00 python python-3.x iteration foreach

问题描述

例如，这段代码可以在没有break(并且没有continue或return)的情况下重写吗?

For example, can this code be rewritten without break (and without continue or return)?

import logging

for i, x in enumerate(x):
    logging.info("Processing `x` n.%s...", i)
    y = do_something(x)
    if y == A:
        logging.info("Doing something else...")
        do_something_else(x)
    elif y == B:
        logging.info("Done.")
        break

由于有些人批评在循环中使用 break 和 continue，我想知道 Python 是否允许编写 for 循环而不使用他们.我会说 Python 不允许这样做(也许它会违反一种方法"的规则).

Since some people criticize the use of break and continue inside loops, I was wondering whether Python allowed to write for loops without them. I would say that Python doesn't allow this (and maybe it would go against the "one way to do it" rule).

评论者让我注意到可以使用 return 代替，但这也不是解决方案.

Commenters have made me notice that return could be used instead, but that would not be a solution, either.

解决方案

你总是可以使用一个函数并从它返回:

You could always use a function and return from it:

import logging

def func():
    for i, x in enumerate(x):
        logging.info("Processing `x` n.%s...", i)
        y = do_something(x)
        if y == A:
            logging.info("Doing something else...")
            do_something_else(x)
        elif y == B:
            logging.info("Done.")
            return # Exit the function and stop the loop in the process.
func()

虽然在我看来使用 break 更优雅，因为它让你的意图更清晰.

Although using break is more elegant in my opinion because it makes your intent clearer.

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