Line continuation for list comprehensions or generator expressions in python

by 
[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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