How to Compare Two CSV Files and Remove Common Lines in Python

Learn how to efficiently compare two CSV files and remove matching lines using Python. This guide includes a step-by-step solution using built-in Python functions.
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How to Compare Two CSV Files and Remove Common Lines in Python

Understanding the Problem

Imagine you have the following two CSV files:

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The Solution

To achieve this, we can use a simple Python script that leverages built-in functions. Below, I will break down the solution into meaningful steps so you can follow along easily.

Step 1: Read the Files

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Step 2: Split the Content into Lines

Next, we’ll convert the content of each file into a list of lines. This will allow us to iterate through them more effectively.

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Step 3: Compare and Filter Lines

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Step 4: Write the Filtered Data Back to the Master File

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Complete Solution Code

Here’s the complete script combining all the steps above:

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Expected Output

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Conclusion

In this post, we've successfully explored how to compare two CSV files and remove common lines based on specific criteria using simple Python code. This approach keeps your master file clean and organized, allowing you to work with only the data you need. Whether you're a beginner or an experienced programmer, this method can streamline your data management process. Happy coding!