Deleting multiple elements from a list


Question

Is it possible to delete multiple elements from a list at the same time? If I want to delete elements at index 0 and 2, and try something like del somelist[0], followed by del somelist[2], the second statement will actually delete somelist[3].

I suppose I could always delete the higher numbered elements first but I'm hoping there is a better way.

1
138
10/25/2014 11:34:54 AM

Accepted Answer

Probably not the best solution for this problem:

indices = 0, 2
somelist = [i for j, i in enumerate(somelist) if j not in indices]
96
1/27/2015 2:34:15 AM

For some reason I don't like any of the answers here. Yes, they work, but strictly speaking most of them aren't deleting elements in a list, are they? (But making a copy and then replacing the original one with the edited copy).

Why not just delete the higher index first?

Is there a reason for this? I would just do:

for i in sorted(indices, reverse=True):
    del somelist[i]

If you really don't want to delete items backwards, then I guess you should just deincrement the indices values which are greater than the last deleted index (can't really use the same index since you're having a different list) or use a copy of the list (which wouldn't be 'deleting' but replacing the original with an edited copy).

Am I missing something here, any reason to NOT delete in the reverse order?


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