doubled_items = [x for x in (items := get_items()) if x * 2 in items]
This will leak 'items' into the surrounding scope (but not 'x'). At the risk of stating the obvious - wasn't there work in Python 3 to
On 21/04/18 08:46, Chris Angelico wrote: prevent leakage from comprehensions ?
[x for x in x if x] # This works [x for y in x if x := y] # UnboundLocalError
The standard library example given earlier notwithstanding, I can see no benefit in using the same name as the iterator and the loop target name. To be honest I have trouble parsing that first version, and keeping track of which x is which (especially which x is being used in the conditional clause) : surely this would be better : [x_item for x_item in x if x_item] Your 2nd example makes no sense to me as to the intention of the code - the re-use of the name x is confusing at best. -- Anthony Flury email : *Anthony.flury@btinternet.com* Twitter : *@TonyFlury <https://twitter.com/TonyFlury/>*