python - Styling multi-line conditions in 'if' statements?

Question

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Answer 1

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

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

Both of those are fairly ugly though.

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

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

This at least gives you some differentiation.

Or even:

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

I think I prefer:

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

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