docstr: Calculates the rel. progress in percent with 2 decimal points.
docstr_tok: ["Calculates","the","rel",".","progress","in","percent","with","2","decimal","points","."]
code: def _calc_percent(self):
      """Calculates the rel. progress in percent with 2 decimal points."""
      return round(self.cnt / self.max_iter * 100, 2)
  
imports: import os
  import sys
  import time
  from io import UnsupportedOperation
label_desc: Use image node_id 7 for calling the Prog obj's underlying member method code with example usage: obj._calc_percent() and returns: round