Add two tuples element-wise in Python

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Borislav Hadzhiev

Last updated: Jun 29, 2022

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Add two tuples element-wise in Python #

To add two tuples element-wise:

  1. Use the zip function to get an iterable of tuples with the corresponding items.
  2. Use a list comprehension to iterate over the iterable.
  3. On each iteration, pass the tuple to the sum() function.
main.py
tuple_1 = (1, 2, 3) tuple_2 = (4, 5, 6) # 👇️ [(1, 4), (2, 5), (3, 6)] print(list(zip(tuple_1, tuple_2))) result = [sum(tup) for tup in zip(tuple_1, tuple_2)] print(result) # 👉️ [5, 7, 9]

The zip function iterates over several iterables in parallel and produces tuples with an item from each iterable.

main.py
tuple_1 = (1, 2, 3) tuple_2 = (4, 5, 6) # 👇️ [(1, 4), (2, 5), (3, 6)] print(list(zip(tuple_1, tuple_2)))

You can imagine that the zip() function iterates over the tuples, taking 1 item from each.

The first tuple in the list consists of the elements in each tuple that have an index of 0, and the second tuple consists of the elements in each tuple that have an index of 1.

The last step is to use a list comprehension to iterate over the zip object and sum each tuple.

main.py
tuple_1 = (1, 2, 3) tuple_2 = (4, 5, 6) # 👇️ [(1, 4), (2, 5), (3, 6)] print(list(zip(tuple_1, tuple_2))) result = [sum(tup) for tup in zip(tuple_1, tuple_2)] print(result) # 👉️ [5, 7, 9]
List comprehensions are used to perform some operation for every element, or select a subset of elements that meet a condition.

The sum function takes an iterable, sums its items from left to right and returns the total.

On each iteration, we pass the current tuple to the sum() function and get the total.

You can also use this approach to add more than two tuples element-wise.

main.py
tuple_1 = (1, 2, 3) tuple_2 = (4, 5, 6) tuple_3 = (7, 8, 9) # 👇️ [(1, 4, 7), (2, 5, 8), (3, 6, 9)] print(list(zip(tuple_1, tuple_2, tuple_3))) result = [sum(tup) for tup in zip(tuple_1, tuple_2, tuple_3)] print(result) # 👉️ [12, 15, 18]
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