add 1 number to all elements in list python code example

Example 1: delete all elements in list python

mylist = [1, 2, 3, 4]
mylist.clear()

print(mylist)
# []

Example 2: append two list of number to one python

listone = [1,2,3]
listtwo = [4,5,6]
mergedlist = []
mergedlist.extend(listone)
mergedlist.extend(listtwo)