A list is a data structure that allows you to add multiple objects in one variable. Let’s say you have two lists and want to add them elementwise. In this post, you will learn how to add two lists in a python element wise using the different methods.
Methods to Add two lists in python Element wise
Lets know all the method to add two lists.
Method 1: Using the map and operator module
The operator module contains a large number of functions that are more efficient than the intrinsic function or inbuilt function of python. Import the add operator and performs the addition of the two lists using the map function.
from operator import add
list1 = [10,20,30,40]
list2 = [1,1,1,1]
result =list( map(add, list1, list2))
print(result )Output
Method 2: zip() function with list comprehension
The second method to add two lists in python is to zip the two lists and then do the addition using list comprehension. List Comprehension is the single-line function.
list1 = [10,20,30,40]
list2 = [1,1,1,1]
result = [sum(x) for x in zip(list1,list2)]
print(result)Output
Method 3: Using lambda and map function
In this method, you will use lambda to add and perform addition element-wise and map this function to the input list.
list1 = [10,20,30,40]
list2 = [1,1,1,1]
sum = list(map(lambda x, y: x + y, list1, list2))
print(sum)Output
Method 4: Using For loop
You can also use the for loop to add two lists in a python element-wise. Firstly you have to declare an empty list. After that with each iteration find the sum of the elements and append it to the empty list. The final result you will get is the sum of the elements elementwise.
list1 = [10,20,30,40]
list2 = [1,1,1,1]
sum = []
for i in range(len(list1)):
sum.append(list1[i] +list2[i] )
print(sum)Output
Method 5: Using the numpy module
The other method to find the sum of the two lists is the use of the numpy module. Here you have to first convert each input list to the numpy array and then perform the addition simply using the ” + ” operator.
import numpy as np
list1 = [10,20,30,40]
list2 = [1,1,1,1]
array1 = np.array(list1)
array2 = np.array(list2)
sum = array1+array2
print(list(sum))Output
Conclusion
There are many ways to add two lists in a python element-wise. In this post, you learned all the methods to perform this operation. You also learned the difference between all the methods.
We hope you have learned something new from this post. If you have any questions then you should contact us for getting more information about this post.
