how to add _ to list in pythin code example

Example 1: add something to list python

#append to list
lst = [1, 2, 3]
something = 4
lst.append(something)
#lst is now [1, 2, 3, 4]

Example 2: python add item to list

# to add an item to a list
list.append(item)

# To extend an list with a new list
list1.extend(list2)