Python filter lines based on field match from another file

Title: Filtering Lines Based on Field Match from Another File in Python Introduction: Filtering lines from one file based on a field match from another file is a common data manipulation task in Python. This tutorial will guide you through the process of accomplishing this task using Python&built-in functions and libraries. Requirements: Step 1: Reading the Source and Filter Files To start, you need to read the contents of both the source file and the filter file. You can use Python&built-in open function to do this. Make sure the files are in the same directory or provide the full path to each file. Step 2: Filtering Lines Now that you have the content of both files, you can filter the lines from the source file based on a field match from the filter file. We&use a list comprehension to achieve this. Assuming you want to match lines in the source file based on the first field, separated by a delimiter (e.g., a comma), you can do the following: Step 3: Writing the Filtered Lines to a New File Once you have the filtered lines, you can write them to a new file. This step ensures that the original source file remains unchanged. Step 4: Running the Script Save the entire script in a .py file and run it in your Python environment. The filtered lines will be written to the filtered_output.txt file and optionally printed to the console. Example: Let&say you have a source file (source.txt) with the following content: And a filter file (filter.txt) with the following content: After...