Python Program to Concatenate Two Lists – 2022

Machine Learning Projects

Hey guys, in this blog we will see a Python Program to Concatenate Two Lists.

Example 1: Using + operator

list_1 = [1, 'a']
list_2 = [3, 4, 5]

list_joined = list_1 + list_2
print(list_joined)

Output

[1, ‘a’, 3, 4, 5]

  • + operator can be used to simply join 2 lists.

Example 2: Using iterable unpacking operator *

list_1 = [1, 'a']
list_2 = range(2, 4)

list_joined = [*list_1, *list_2]
print(list_joined)

Output

[1, ‘a’, 2, 3]

  • * is used to unpack all the items of an iterable.
  • Here we have unpacked the elements of both lists in a new list.

Example 3: With unique values

list_1 = [1, 'a']
list_2 = [1, 2, 3]

list_joined = list(set(list_1 + list_2))
print(list_joined)

Output

[1, 2, 3, 'a']
  • Here also we used + operator to merge two lists and then we converted it to a set to eliminate all the duplicate values.
  • Then again we are converting it back to a list.

Example 4: Using extend()

list_1 = [1, 'a']
list_2 = [1, 2, 3]

list_2.extend(list_1)
print(list_2)

Output

[1, 2, 3, 1, ‘a’]

  • All lists have an inbuilt function called extend() which is used to add a new list to the current list.

Check out our other python programming examples

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