How can a Python script identify the files that have been downloaded and are listed in a .txt file?

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Here's one way to approach the problem in Python:

1. Read in the contents of the .txt file using the built-in open() function:

with open("downloaded_files.txt", "r") as f:
    downloaded_files = f.read().splitlines()

This will create a list called downloaded_files containing all the filenames listed in the .txt file.

1. Use the built-in os library to check if each file exists in the current directory:

import os

for file in downloaded_files:
    if os.path.exists(file):
        print(f"{file} exists")
    else:
        print(f"{file} does not exist")

This code will loop through each filename in downloaded_files and use os.path.exists() to check if the file exists in the current directory. If the file exists, it will print a message saying so. If it doesn't exist, it will print a message saying so.

Note: This assumes that the .txt file lists filenames without any directory paths. If the filenames include directories, you'll need to modify the os.path.exists() check accordingly.