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Learn how to read a text file in Python and convert its content into a structured `list of lists` format. Perfect for beginners wanting to improve their file handling skills.
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This video is based on the question https://stackoverflow.com/q/73515895/ asked by the user 'firstyearpleb' ( https://stackoverflow.com/u/19861562/ ) and on the answer https://stackoverflow.com/a/73516007/ provided by the user 'Vivek Maddeshiya' ( https://stackoverflow.com/u/18246635/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Convert a Text File into a List of Lists in Python

Reading data from a text file and organizing it into a structured format is a common task in programming. In this post, we'll tackle a specific problem: converting a text file with names and numbers into a list of lists in Python.

The Problem

Imagine you have a text file formatted like this:

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

You want to convert this into a structured format where each name is associated with its corresponding list of numbers, resulting in:

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

However, the initial attempt to read and format the data resulted in each item being treated separately, thus not retaining the names and numbers in their intended structure.

Solution

To solve this problem, we need to implement a Python script that reads the data line by line, checks whether the line is odd or even, and then organizes the content accordingly.

Step-by-step Explanation

Open the File: We start by opening the text file for reading.

Initialize Variables: We will create an empty list, list_of_lists, to store our results, and a couple of counters to track lines.

Read the File Line by Line: As we loop through each line:

If it's an odd line (for example, the name), we append it as a first element of a new sublist.

If it's an even line (the numbers), we split it into individual integers and append them to the last sublist created.

Close the File: After processing, we must ensure that we close the file.

Here’s the code to accomplish this:

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

Output

When you run this code, it will successfully print:

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

Conclusion

By following the steps outlined above, you can effectively convert a text file into a structured list of lists in Python. This technique is particularly useful for organizing data in a way that can be easily manipulated or analyzed later.

If you have any questions or need further assistance, feel free to ask! Happy coding!