datetime and file write and backup

import os
import shutil
import datetime

now = datetime.datetime.now()
file_name = 'test.txt'

#test.If you have a file called txt
#Create a backup file that includes the date and time in the file name
if os.path.exists(file_name):
    shutil.copy(file_name, '{}.{}'.format(
        file_name, now.strftime('%Y_%m_%d_%H_%M_%S')))
#test.Create a file with the name txt and the contents are test
with open(file_name, 'w') as f:
    f.write('test')

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