Question

Add elements of one list at the end of another list in python

Answer 1

Answer:

Appending one list to another results in a list that contains all the values of the first and second list. For example, a list [3, 4] appended to [1, 2] will result in the combined [1, 2, 3, 4]. A list can also be appended as an element to produce a list inside of a list such as [1, 2, [3, 4]].

USE list.extend() TO COMBINE TWO LISTS

Use the syntax list1.extend(list2) to combine list1 and list2.

list1 = [1, 2]

list2 = [3, 4]

list1.extend(list2)

Combine list1 and list2

print(list1)

OUTPUT

[1, 2, 3, 4]

USE list.append() TO ADD A LIST INSIDE OF A LIST

Use the syntax list1.append(list2) to add list2 to list1.

list1 = [1, 2]

list2 = [3, 4]

list1.append(list2)

Add list2 to list1

print(list1)

OUTPUT

[1, 2, [3, 4]]

OTHER SOLUTIONS

Use itertools.chain() to combine many lists

This solution is more efficient because it avoids copying the lists.

Further reading: See documentation for itertools.chain()

Explanation: