(This is my first time posting on any Python list; I've tried to search for this idea and didn't find it but if I looked in the wrong places/this has already been discussed I apologize and feel free to tell me!)
Say you have a list and you want to perform some operation on each item in the list - but you don't need to store the result in a list.
There are three simple ways of doing this, at least as far as I know: ([print(item)] could be any expression, just using it as an example)
``` lst = [1, 2, 3, 4]
#1 for item in lst: print(item)
# 2 [print(item) for item in lst]
# 3 for item in lst: print(item) ```
#1 - In my opinion, this should be a one line operation so #1 is not ideal. #2 - It also shouldn't require storing results in array, to save time/memory, so #2 is out. #3 - I think #3 is just not good syntax, it seems very unpythonic to me - it breaks the norm that blocks go on their own lines. It does seem the best of the three though and I know my assessment is kind of subjective.
I'm wondering if a possible alternative syntax could be a for-expression, like there's if-expressions, which always evaluates to None: ``` print(item) for item in lst ```
A more practical example of when this would be useful is extending list-2 with a modified version of list-1 - this syntax would avoid creating an intermediate list (not sure if the way lists are implemented in python removes this advantage by the way it resizes lists though).
``` lst1 = [1, 2, 3] lst2 = [4, 5, 6] lst1.append(item * 2) for item in lst1 ```