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#append: Appends object at end.

x = [1, 2, 3]
x.append([4, 5])
print (x)
#gives you: [1, 2, 3, [4, 5]]

#extend: Extends list by appending elements from the iterable.

x = [1, 2, 3]
x.extend([4, 5])
print (x)
#gives you: [1, 2, 3, 4, 5]