CODEWITHSUNDEEP
pythonsyntax
zell
zell

Reputation: 10204

Make a pythonic one line statement like "return True if flag"?

Is there a way to write a one line python statement for 

if flag:
   return True

Note that this can be semantically different from 

return flag

In my case, None is expected to be returned otherwise.

I have tried with "return True if flag", which has syntactic error detected by my emacs.

Upvotes: 2

Views: 571

Answers (3)

unutbu
unutbu

Reputation: 879739

You could use:

return bool(flag) or None

Upvotes: 1

Padraic Cunningham
Padraic Cunningham

Reputation: 180441

You could use bool return bool(flag) if you return False when the flag is a falsey value.

Or maybe the following depending on whether you return None:

 return True if flag else None

If you are testing the return value if False and if True will both evaluate to False so unless you are explicitly testing for None then return bool(flag) is sufficient.

Upvotes: 0

Xymostech
Xymostech

Reputation: 9850

return True if flag doesn't work because you need to supply an explicit else. You could use:

return True if flag else None

to replicate the behaviour of your original if statement.

Upvotes: 8

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