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Python Python for File Systems Manipulation Consistency

Not sure what to do

I'm guessing the question expects you to use regular expressions, but I have no idea how.

import os

# Filenames consist of a username (alphanumeric, 3-12 characters)
# and a date (four digit year, two digit month, two digit day),
# and an extension. They should end up in the format
# year-month-day-username.extension.

# Example: kennethlove2-2012-04-29.txt becomes 2012-04-29-kennethlove2.txt

def cleanup(path):
    # your code here
    for root, files, dirs in os.walk(path):
        for name in files:
            nameWithoutExtenstion = name.split('.')[0]
            nameExtension = name.split('.')[1]

            nameArray = nameWithoutExtension.split('-')
            newName = nameArray[1] + '-' + nameArray[2] + '-' + nameArray[3] + '-' + nameArray[0] + '.' + nameExtension

            os.rename(os.path.join(path, name), os.path.join(path, newName))