pythonic方法在if语句中重写赋值 [英] pythonic way to rewrite an assignment in an if statement

问题描述

有没有一种pythonic首选的方法来做我在C ++中做的事情：

Is there a pythonic preferred way to do this that I would do in C++:

for s in str:
    if r = regex.match(s):
        print r.groups()

我非常喜欢这种语法，因为它比在任何地方都有临时变量要清晰得多。另一种不太复杂的方式是

I really like that syntax, imo it's a lot cleaner than having temporary variables everywhere. The only other way that's not overly complex is

for s in str:
    r = regex.match(s)
    if r:
        print r.groups()

I猜猜我在抱怨一个非常迂腐的问题。我只是错过了以前的语法。

I guess I'm complaining about a pretty pedantic issue. I just miss the former syntax.

推荐答案

怎么样

for r in [regex.match(s) for s in str]:
    if r:
        print r.groups()

或更多功能

for r in filter(None, map(regex.match, str)):
    print r.groups()

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