How to Use re.sub for Multiple Pattern Replacements in a List of Lists in Python

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The Challenge

Suppose you have the following input, which is a list of lists:

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Your goal is to transform old_list into a new_list that looks like this:

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The tasks that you want to accomplish include:

Removing certain punctuation marks.

Replacing specific keywords with spaces or other terms.

Crafting the Solution

1. Define Your Patterns

First, we need to create a dictionary to hold the regex patterns and their corresponding replacements. It’s essential to prefix your regex patterns with r, making them raw strings, which is crucial for avoiding escape characters issues.

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2. Initialize Your New List

It is vital to set the new_list variable to hold the state of old_list at the beginning. This establishes a base for your iterations.

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3. Loop Through Patterns

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4. Viewing the Results

Finally, print both the original and the new lists to observe the changes:

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Example Code in Action

Here's how the complete code looks when combined:

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Conclusion