old_contents: #!/usr/bin/env python
  
  import snapshot, sys
  
  if len(sys.argv) == 2:
      print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], ""))
  else:
      print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], sys.argv[3]))
  
new_contents: #!/usr/bin/env python
  
  import snapshot, sys
  
  if len(sys.argv) == 3:
      print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], ""))
  else:
      print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], sys.argv[3]))
  
subject: Fix condition in snapshot script. Argv is never 2 long, it can be 3 or 4.