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Скачать или смотреть Mastering Pandas: Row-by-Row Re-Ordering of Multi-Index Columns in DataFrames

  • vlogize
  • 2025-05-27
  • 1
Mastering Pandas: Row-by-Row Re-Ordering of Multi-Index Columns in DataFrames
Pandas re-ordering values in Multi-Index columns on a row-by-row basispythonpandasdataframe
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Описание к видео Mastering Pandas: Row-by-Row Re-Ordering of Multi-Index Columns in DataFrames

Discover the method to efficiently re-order values in Multi-Index columns in `Pandas` DataFrames on a row-by-row basis, enhancing your data manipulation skills.
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This video is based on the question https://stackoverflow.com/q/66581283/ asked by the user 'BenjaminClayton' ( https://stackoverflow.com/u/14611791/ ) and on the answer https://stackoverflow.com/a/66584108/ provided by the user 'aneroid' ( https://stackoverflow.com/u/1431750/ ) 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: Pandas re-ordering values in Multi-Index columns on a row-by-row basis

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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.

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Mastering Pandas: Row-by-Row Re-Ordering of Multi-Index Columns in DataFrames

Working with Multi-Index columns in Pandas can be complex, especially when it comes to re-ordering values based on specific criteria. If you have a Multi-Index DataFrame where you want to reorder columns based on values in a specific row, this guide will walk you through an effective solution.

Understanding the Problem

In your situation, you have a Pandas DataFrame with a Multi-Index structure, and your goal is to reorder the columns based on the x values at t_1. Let’s clarify what's happening with an example:

Example DataFrame Overview

You have a DataFrame structured as follows:

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

Each row corresponds to values x and y at two time levels: t_1 and t_2.

The x values at t_1, highlighted in italics, will be used for the reordering process.

Desired Outcome

You want to produce a new DataFrame that looks like the following, where each row has been reordered according to the x values at t_1:

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

The Solution

To achieve this reordering in your DataFrame, you can use the following code snippet:

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

Code Explanation

Transform and Reshape:

The method df.T.unstack(level=0).T changes the shape of the DataFrame, allowing us to manipulate rows and columns more easily.

Sorting:

Use sort_values to order rows based on the specified criteria. The first argument is the MultiIndex column check followed by the column upon which to sort (t_1, x).

Rebuilding the DataFrame:

The sorted values are reshaped and fed into a new DataFrame, df3, which retains the original column names.

Output

This manipulation produces a DataFrame with reordered columns while preserving the basic structure and data integrity:

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

Conclusion

The ability to reorder rows in Multi-Index DataFrames based on specific values enhances your data manipulation capabilities in Pandas. With the provided technique, you can customize operations to meet various analytical needs. Experiment with this approach to transform your data effectively!

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