On final try-except to go back just as loop

[mardiyah]

How do we do final try-except to go back to start (at start of loop) ? e.g . 
illustrated to go from --->
    
    
     # START OF LOOP
     echo "Write to a file name:"
     outputFile=readLine(stdin)
     
     if outf.len > 0:
      if fileExists(outf):
       echo "There exists file name '",putFile,"'\nOverwrite it (y: Yes. Else 
key: No)?"
       if getch() != 'y': # --->
      try: writeFile(outputFile,whole)
      except IOError as e:
       echo "\nCannot write to '",outputFile,"': "
      finally: # --->
    
    
    Run