code: def start_trace(
          full=False, frame=None, below=0, under=None, server=None, port=None
  ):
      
      wdb = Wdb.get(server=server, port=port)
      if not wdb.stepping:
          wdb.start_trace(full, frame or sys._getframe().f_back, below, under)
      return wdb
docs: Start tracing program at callee level
         breaking on exception/breakpoints