Python Bulk Rename Script

# os is a library that gives us the ability to make OS changes
import os

def increment_file_numbers(directory, number):
    # iterate over every file name in the directory
    print directory
    for file_name in os.listdir(directory):

        # we know that first two characters are numbers
        print file_name
        file_number = int(file_name[0:2])

        # we only increment the files that are bigger than number
        if file_number > number:
            new_file_number = file_number + 1

            # use string formatting to pad single-digit nums w/ a 0
            new_file_name = '%s/%02d%s' % (directory, new_file_number, file_name[2:])
            old_file_name = '%s/%s' % (directory, file_name)

            # rename the file!
            os.rename(old_file_name, new_file_name)

# This is the path to these videos on my computer
PATH = os.path.abspath('/Users/andrewbrown/Desktop/movie_test')

# Let's increment all the files w/ numbers above 11
increment_file_numbers(PATH, 11)