Скачать или смотреть How to Combine Multiple Lists of True Values in Python

Discover a Pythonic way to merge multiple lists with `True` values into a single list, effectively using logical operations for cleaner code!
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This video is based on the question https://stackoverflow.com/q/70443273/ asked by the user 'Umair Shahid' ( https://stackoverflow.com/u/17218130/ ) and on the answer https://stackoverflow.com/a/70443302/ provided by the user 'Diego Avila' ( https://stackoverflow.com/u/9489134/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Merging True Values in Lists

When working with multiple lists in Python, particularly those containing boolean values, you may find yourself needing to combine these lists into a single list based on the presence of True values at corresponding indices. This operation can be particularly useful in areas such as data analysis, decision-making algorithms, or simply managing various flags in a clean and efficient manner.

The Scenario

Let's consider a practical example to illustrate this problem. Suppose you have two boolean lists, l1 and l2, both initialized to False. You set certain positions in these lists to True:

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The output of these lists looks like this:

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Your goal is to create a new list (l_full) where each index reflects whether any of the original lists have True at that position. The desired output should look as follows:

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The Solution: Using Logical Operations

To achieve this, you can utilize the numpy library, which offers a very efficient implementation for managing arrays and performing logical operations. Specifically, the np.logical_or function allows you to combine boolean arrays in a way that returns True if at least one of the values in the corresponding indices is True.

Step-by-Step Implementation

Here's how to code this solution effectively:

Import the Required Library: Start by importing the numpy library.

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Initialize Your Lists: Create your boolean lists and set the desired positions to True.

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Combine the Lists: Use the np.logical_or function to merge the lists.

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Check the Output: You can print out the resulting combined list to see the outcome.

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Final Thoughts

This method efficiently combines any number of boolean lists of equal length by checking for True values in a straightforward and readable manner. Using logical operations not only simplifies your code but also enhances its readability and performance.

By utilizing the numpy library, you can apply these techniques seamlessly, ensuring you can handle boolean operations in lists with ease. Happy coding!