code: def trace(line):
      
      args = line.split()
      enable = args[0] in {'enable', 'on'}
  
      if not enable:
          sys.settrace(None)
          sys.stdout = _ORIGINAL_STDOUT
          return
  
      pattern = args[1] if len(args) > 1 else None
      sys.stdout = open(args[2], 'a') if len(args) > 2 else sys.stdout
      sys.settrace(partial(trace_line, pattern))
docs: Usage: %trace (enable|disable) [file pattern] [output path]