Python-extend v append on a list (comparison between extend and append in the list in Python)

Comparison between extend and append in list in Python

What's the difference? If you append a list to another list, you add the new list as a single extra list to the original, thus makingthe original list just one longer with an item that is itself a list. but if you extend a list with another list, you add each element of the new list onto the original. here's an example to show you what I mean:

>>> First = [10, 20, 30]
>>> Second = [40, 50, 60]
>>> First. append ([70, 80, 90])
>>> Second. Extend ([2, 100,110,120])
>>> First
[10, 20, 30, [70, 80, 90]
>>> Second
[40, 50, 60,100,110,120]
>>>