title: Python: Opening a file without creating a lock
body: <p>I'm trying to create a script in Python to back up some files. But, these files could be renamed or deleted at any time. I don't want my script to prevent that by locking the file; the file should be able to still be deleted at any time during the backup.</p>
  
  <p>How can I do this in Python? And, what happens? Do my objects just become null if the stream cannot be read?</p>
  
  <p>Thank you! I'm somewhat new to Python.</p>