docstr: Return the input string centered in a 'marquee'.
docstr_tok: ["Return","the","input","string","centered","in","a","'marquee","'","."]
code: def marquee(self, txt="", width=78, mark="*"):
      """Return the input string centered in a 'marquee'."""
      return marquee(txt, width, mark)
  
imports: import os
  import re
  import shlex
  import sys
  import pygments
  from pathlib import Path
  from IPython.utils.text import marquee
  from IPython.utils import openpy
  from IPython.utils import py3compat
label_desc: Use image node_id 16 for calling the Demo obj's underlying member method code with example usage: obj.marquee(txt, width, mark) and returns: marquee