在“if"语句中设置多行条件样式? [英] Styling multi-line conditions in 'if' statements?

问题描述

有时我将 ifs 中的长条件分成几行.最明显的方法是:

Sometimes I break long conditions in ifs onto several lines. The most obvious way to do this is:

  if (cond1 == 'val1' and cond2 == 'val2' and
      cond3 == 'val3' and cond4 == 'val4'):
      do_something

在视觉上不是很吸引人，因为动作与条件融合在一起.然而，这是使用正确的 4 个空格缩进的自然方式.

Isn't very very appealing visually, because the action blends with the conditions. However, it is the natural way using correct Python indentation of 4 spaces.

目前我正在使用:

  if (    cond1 == 'val1' and cond2 == 'val2' and
          cond3 == 'val3' and cond4 == 'val4'):
      do_something

但这不是很漂亮.:-)

But this isn't very pretty. :-)

你能推荐一种替代方法吗?

Can you recommend an alternative way?

推荐答案

您不需要在第二个条件行上使用 4 个空格.也许使用:

You don't need to use 4 spaces on your second conditional line. Maybe use:

if (cond1 == 'val1' and cond2 == 'val2' and 
       cond3 == 'val3' and cond4 == 'val4'):
    do_something

另外，不要忘记空格比你想象的更灵活:

Also, don't forget the whitespace is more flexible than you might think:

if (   
       cond1 == 'val1' and cond2 == 'val2' and 
       cond3 == 'val3' and cond4 == 'val4'
   ):
    do_something
if    (cond1 == 'val1' and cond2 == 'val2' and 
       cond3 == 'val3' and cond4 == 'val4'):
    do_something

虽然这两个都相当丑陋.

Both of those are fairly ugly though.

可能会丢失括号(样式指南 虽然不鼓励这样做)?

Maybe lose the brackets (the Style Guide discourages this though)?

if cond1 == 'val1' and cond2 == 'val2' and 
   cond3 == 'val3' and cond4 == 'val4':
    do_something

这至少给了你一些区别.

This at least gives you some differentiation.

甚至:

if cond1 == 'val1' and cond2 == 'val2' and 
                       cond3 == 'val3' and 
                       cond4 == 'val4':
    do_something

我想我更喜欢:

if cond1 == 'val1' and 
   cond2 == 'val2' and 
   cond3 == 'val3' and 
   cond4 == 'val4':
    do_something

这是风格指南，其中(自 2010 年起)建议使用方括号.

Here's the Style Guide, which (since 2010) recommends using brackets.

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