Jabba Laci wrote:
Hi,
Pylint gives me a warning for the function "filter". As I know, this
function is not deprecated. Is the usage of list comprehensions
encouraged? Should I avoid "filter" (and why)?
This is not a pylint question but a general python question, so you seem to be
at the wrong place :)
Nevertheless, I'll try to give an answer :)
I think indeed that list comprehensions are encouraged, and in my opinion, for
good reasons.
Try to implement the following list comprehensions with filter (and map).
[ x for x in L if x > 3 ]
[ x + 1 for x in L if x > 3 ]
[ (x,y) for x in L if x > 3 for y in L if y < x ]
While I am sure you can write a filter/map/lambda expression that computes them, I am also sure none
of your results is more readable[1] than the above list comprehensions.
For bigger list comprehensions, it gets worse.
I hope this clarifies a bit why filter is not recommended.
Albert
[1] Readable for the general Python user which typically has not seen any functional programming
concepts like map and filter.
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