On 9/8/20 7:06 PM, Mats Wichmann wrote: > On 9/7/20 5:01 PM, Driuma Nikita wrote: > > > _list = list(range(50)) > for i, el in enumerate(_list): > del _list[i] > print(_list) > > > Don't change the the list while you are iterating over it, it messes up > the iteration. It's not "randomly deleting", it's when next is called to > fetch the next item, the list has changed. > > One workaround is to iterate over a copy. For example here's using > slicing to create a new list to iterate over: > > for i, el in enumerate(_list[:]): > del _list[i] > The issue isn't so much that he is modifying the list that he is iterating over, but also when he deletes _list[0], all the other elements move down, so the next time when he does a del _list[1], that will delete what started as _list[2], and with your code, when he gets half way done he will hit an index error as he tries to delete _list[26] from a list with only 25 elements.
-- Richard Damon -- https://mail.python.org/mailman/listinfo/python-list
