Can you assist me in renaming all the PDF files in a directory using two specific criteria in Python?

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Sure. Here's a Python code snippet that renames all the PDF files in a directory based on two criteria:

1. Adding a prefix to the file name
2. Removing a specific string from the file name

import os

# Define the directory containing the PDF files
directory = "/path/to/directory"

# Define the prefix to be added to the file name
prefix = "new_"

# Define the string to be removed from the file name
remove_string = "old_"

# Loop through all the PDF files in the directory
for filename in os.listdir(directory):
    if filename.endswith(".pdf"):
        # Rename the file by adding a prefix and removing the specified string
        new_filename = prefix + filename.replace(remove_string, "")
        os.rename(directory+"/"+filename, directory+"/"+new_filename)

In this code, you need to replace "/path/to/directory" with the path to the directory containing the PDF files you want to rename. You also need to replace "new" with the prefix you want to add to the file names and "old" with the string you want to remove from the file names.