在python中列表推导或生成器表达式的行连续 [英] Line continuation for list comprehensions or generator expressions in python

问题描述

  [something_that_is_pretty_long for something_that_is_pretty_long in somethings_that_are_pretty_long] 
 

我也看过不喜欢使用'\'分隔行的人，
从来没有理解为什么。这是什么原因？

解决方案

  [x 
 for 
x 
 in 
（1,2,3）
] 
  

工作正常，所以你可以几乎做你喜欢。我个人宁愿

  [something_that_is_pretty_long 
 for something_that_is_pretty_long 
 in somethings_that_are_pretty_long] 
  

之所以不太赞赏 \ 出现在一行的 end ，它或者不突出或需要额外的填充，当行长度改变时必须固定：

  x = very_long_term \ 
 + even_longer_term_than_the_previous \ 
 + a_third_term 
  

在这种情况下，使用括号：

  x =（very_long_term 
 + even_longer_term_than_the_previous 
 + a_third_term）
  




How are you supposed to break up a very long list comprehension?

[something_that_is_pretty_long for something_that_is_pretty_long in somethings_that_are_pretty_long]

I have also seen somewhere that people that dislike using '\' to break up lines, but never understood why. What is the reason behind this?

解决方案

[x
 for
 x
 in
 (1,2,3)
]

works fine, so you can pretty much do as you please. I'd personally prefer

 [something_that_is_pretty_long
  for something_that_is_pretty_long
  in somethings_that_are_pretty_long]

The reason why \ isn't appreciated very much is that it appears at the end of a line, where it either doesn't stand out or needs extra padding, which has to be fixed when line lengths change:

x = very_long_term                     \
  + even_longer_term_than_the_previous \
  + a_third_term

In such cases, use parens:

x = (very_long_term
     + even_longer_term_than_the_previous
     + a_third_term)

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