making a string a given length?

[Z 3 Penguin]

For a python program to interface with gnutella, i need to make a string
(like +ACI-abc+ACI-) a given number of bytes long.  is there anyway to do this
without having to write my own function?

-----
Z 3 Penguin
z3p+AEA-z3penguin.org

  ()
  (o+AF8-
  //+AFw-
+ADw--+AFwAXw-/

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