x is [1,2,3,'a']
But when I do the following:
Why does extend work on a list reference, but not on a list?
I found this because I was trying to append a listB to a listA while trying to extend listC to listB.
Supposing lists cannot be directly appended / extending. What is the most popular work around form for resolving this issue?
list.extend modifies the list in place and returns nothing, thus resulting in
None. In the second case, it’s a temporary list that is being extended which disappears immediately after that line, while in the first case it can be referenced via
to append a listB to a listA while trying to extend listC to listB.
Instead of using
extend, you might want to try this:
listA.append(listB[15:18] + listC[3:12])
Or do it in multiple simple lines with
extend if you want to actually modify
extend will extend list it self. Return type of that method is
If you want to
union 2 list and add that list to another list then you have to use another way to add.
listB[15:18] = listC[3:12] listA.extend(listB)