Python sum two list elements

How to Find the Sum of a List in Python

How to Find the Sum of a List in Python | There are several methods to find the sum of a list in python. As we know the list is a container that stores elements of similar data types. Finding the sum of elements in a list python is an easy task.

• Sum Of Two List In Python
• Sum Of Two Elements In List Python
• Sum Of All Elements In List Python
• Python Sum List Of Strings
• Python Sum List Of Numbers
• Sum Of a List In Python Using For Loop
• Sum Of a List In Python Using Function

Find the Sum of Two List in Python

Here, we find the sum of two lists and store it in a third list.

# Python program to find the sum of two list # take list list1 = [3,6,7,8] list2 = [5,3,7,9] print("List 1:", str(list1)) print("List 2:", str(list2)) # find sum of a list result = [] for i in range(0, len(list1)): result.append(list1[i] + list2[i]) # print sum of a list print("Sum:", str(result))

We take three lists list1, list2, and result and initialize list1 and list2 with some elements and initialize the result as an empty list, use a for loop to iterate over the elements, and add corresponding elements.

Sum of Two Elements in List Python

Previously, we saw how to add two list elements. Now, we will demonstrate the python code, to sum up, two elements in the same list. We can add particular elements to the same list. The code is as follows.

list = [0,8,6] list = list[1] + list[2] print(list)

Here, our aim is to find the sum of two elements in the list. In the above code, we add the second element and the third element hence we get the result as 14.

Sum of All Elements in List Python

Now, we find a sum of all elements in a list. We have implemented this by using a while loop.

sum = 0 elements = 0 list = [55, 33,22] while(elements < len(list)): sum = sum + list[elements] elements += 1 print("Sum of all elements:", sum)

First, we initialize sum to 0 and elements to 0 then we initialize list to sum array we iterate to while loop to add each element.

Python Program to Sum List of Strings

Now, we add a list containing integers, the python behavior of the data type will not change.

def sum_list(list): return sum([int(i) for i in list if type(i) == int or i.isdigit()]) l1 = [5, 'know', 8, 'program'] l2 = ['python', 7, 'code'] print(sum_list(l1)) print(sum_list(l2)) 

The above program finds the digits in the list and then returns the sum.

Python Program to Sum List of Numbers

We use sum() to add a list of numbers, sum() reduces the code length and hence makes for the programmer. The sum() is a function in python that adds the given parameters.

list = [6,5,4,3,2,1] total1 = sum(list) print(total1) total2 = sum(list , 11) print(total2)

Sum usually takes two parameters: the list and a start that is sum(list, start), the start is the optional parameter when specified start the sum function adds the specified start number to the sum of the list. In the code, the sum of the list will be 21 but when the start is added we 32.

Sum of a List in Python using For Loop

We sum all the list elements using a for loop.

i = [4,6,7,9] sum = 0 for number in i: sum = sum + number print("Sum of the list:", sum)

The for loop iterates over each and every element and adds all the list elements. In the code, we have initialized i to list and sum to 0 then iterated in for loop to add each element.

Sum of a List in Python using Function

We define our own function to find the sum of the list. That is we use pre-defined functions to find the sum.

def sum_of_list(list): Sum = 0 for i in range(len(list)): Sum = Sum + list[i] return Sum list = [3, 5, 4, 0] sum = sum_of_list(list) print("Sum of the list:", sum)

We have defined sum_of_list() which takes a list as a parameter. In the function, we initialize the sum to 0 and use a for loop to iterate over the list and return Sum.

If you enjoyed this post, share it with your friends. Do you want to share more information about the topic discussed above or do you find anything incorrect? Let us know in the comments. Thank you!

Источник

How to Sum Elements of Two Lists in Python: Comprehensions and More

Welcome back to another edition of the How to Python series. This time I want to sum elements of two lists in Python. I got the inspiration for this topic while trying to do just this at work the other day. In short, one of the best ways to sum elements of two lists in Python is to use a list comprehension in conjunction with the addition operator. For example, we could perform an element-wise sum of two lists as follows: `[x + y for x, y in zip(list_a, list_b)]`python. But, as always, we’ll take a look at other options.

Table of Contents

Video Summary

Are there any better ways to get this working?

A Little Recap

ethernet_devices = [1, [7], [2], [8374163], [84302738]] usb_devices = [1, [7], [1], [2314567], [0]] # The long way all_devices = [ ethernet_devices[0] + usb_devices[0], ethernet_devices[1] + usb_devices[1], ethernet_devices[2] + usb_devices[2], ethernet_devices[3] + usb_devices[3], ethernet_devices[4] + usb_devices[4] ] # Some comprehension magic all_devices = [x + y for x, y in zip(ethernet_devices, usb_devices)] # Let's use maps import operator all_devices = list(map(operator.add, ethernet_devices, usb_devices)) # We can't forget our favorite computation library import numpy as np all_devices = np.add(ethernet_devices, usb_devices)

As we can see, there are a lot of ways to run an element-wise sum of two lists. Take your pick. As always, thanks for stopping by! If you liked this article, I have a massive list of code snippets just like this for your perusal. If you’re interested in learning more about Python, consider subscribing to The Renegade Coder—or at least hop on our mailing list, so you’ll never miss another article. Tune in next time to learn how to check if a file exists in Python. While you’re here, you might be interested in some these other Python articles:

• How to Automate Your GitHub Wiki
• How I Automated My Grading Responsibilities
• Reverse a String in Python

Once again, thanks for stopping by. I appreciate it!

How to Python (42 Articles)—Series Navigation

The How to Python tutorial series strays from the usual in-depth coding articles by exploring byte-sized problems in Python. In this series, students will dive into unique topics such as How to Invert a Dictionary, How to Sum Elements of Two Lists, and How to Check if a File Exists.

Each problem is explored from the naive approach to the ideal solution. Occasionally, there’ll be some just-for-fun solutions too. At the end of every article, you’ll find a recap full of code snippets for your own use. Don’t be afraid to take what you need!

If you’re not sure where to start, I recommend checking out our list of Python Code Snippets for Everyday Problems. In addition, you can find some of the snippets in a Jupyter notebook format on GitHub,

If you have a problem of your own, feel free to ask. Someone else probably has the same problem. Enjoy How to Python!

Источник

Find sum of two lists in Python

In this article, we will discuss different ways to get the sum of two lists element wise and store that to a new list in Python.

Table Of Contents

Introduction

Suppose we have two lists,

firstList = [21, 23, 13, 44, 11, 19] secondList = [49, 48, 47, 46, 45, 44]

Now we want to add these two lists element wise and store the result in an another list. Contents of this merged list will be,

In the above example, nth item of first list should be added to the nth item of second list, and summed up values should be added to a new list. There are different ways to do this. Let’s discuss them one by one,

Frequently Asked:

Find sum of two lists using zip() and List Comprehension

Pass both the lists to zip() function as arguments. It will return a zipped object, which yields tuples, containing an item from both the lists, until an any one list is exhaused. We can add the items in each of the returned tuple and store the result in a new list. In the end we will get a list containing the sum of two lists element wise. For example,

firstList = [21, 23, 13, 44, 11, 19] secondList = [49, 48, 47, 46, 45, 44] # get the sum of two lists element wise mergedList = [sum(x) for x in zip(firstList, secondList)] print(mergedList)

We added both the lists element wise.

Find sum of two lists using for loop

Create a new empty list. Then, select the smallest list out of the two given lists. Get the size of that smallest list. Iterate from 0 till the size of smallest list. In each ith iteration of for loop, get the sum of values at ith index in both the list and store that at ith position in new list. For example,

firstList = [21, 23, 13, 44, 11, 19] secondList = [49, 48, 47, 46, 45, 44] size = min(len(firstList), len(secondList)) # get the sum of two lists element wise mergedList = [] for i in range(size): value = firstList[i] + secondList[i] mergedList.append(value) print(mergedList)

We added both the lists element wise.

Summary

We learned how to get the sum of two lists in Python. Thanks.

Related posts:

Share your love

Leave a Comment Cancel Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Terms of Use

Disclaimer

Copyright © 2023 thisPointer

To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.

Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.

The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.

The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.

The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.

The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.

Источник