Скачать или смотреть How to Subtract Values from a List in Python

Learn the step-by-step process to `subtract values` from a list in Python, transforming it into a new list with the results.
---
This video is based on the question https://stackoverflow.com/q/73489980/ asked by the user 'HippoCortex' ( https://stackoverflow.com/u/19796824/ ) and on the answer https://stackoverflow.com/a/73490059/ provided by the user 'mrCopiCat' ( https://stackoverflow.com/u/15582911/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to subtract values from a list with values from the same list?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Subtract Values from a List in Python

When working with lists in Python, you might encounter scenarios where you need to perform arithmetic operations between the elements of the same list. A common task is to subtract values in a list from one another to create a new list containing the results of those subtractions. For example, given a list of numbers, you want to subtract the second number from the first, the third from the second, and so forth. In this guide, we’ll walk through a practical approach to accomplishing this task.

Problem Breakdown

Let's say we have a list of numbers:

[[See Video to Reveal this Text or Code Snippet]]

The goal is to create a new list, where each value represents the difference between consecutive numbers from the original list. For instance:

The difference between 280820 and 91747 (second minus first)

The difference between 334845 and 280820 (third minus second)

And so on...

The expected output for this operation should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Solution Overview

To achieve the subtraction of list values in Python, we can utilize the capabilities of list comprehension alongside the zip function. Here’s how to set it all up:

Step 1: Prepare Your List

First, make sure that you have your list of numbers ready in a format that Python can read. Here's how you can define your list:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Utilize List Comprehension

To subtract values from the list and produce a new list, we can use list comprehension combined with the zip function. The zip function allows us to pair elements from two or more lists together conveniently.

Here’s the code that accomplishes our goal:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Print the Result

Finally, we can print out the generated result to see our new list of differences:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Putting it all together, your complete Python code should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Output

After executing the code, the output will be:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing list comprehension and the zip function in Python, you can easily subtract consecutive values in a list and store the results in a new list. This approach is efficient and concise, making it ideal for quick arithmetic operations on lists.

Feel free to adapt this method for your specific needs or try it out with different lists of numbers. Happy coding!