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

问题描述

有时我会在中将长条件分解为多行，如果 s。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

视觉上不是很吸引人，因为动作与条件相融合。但是，这是使用4个空格的正确Python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. :-)

你能推荐另一种方式吗？

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

此外，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

但这两个都相当丑陋。

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

这至少可以让你有所区别。

This at least gives you some differentiation.

或者甚至：

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

这是样式指南，（自2010年起）建议使用括号。

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

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