new_contents: def add_line_breakpoint(plugin, pydb, type, file, line, condition, expression, func_name):
      return None
  
  def add_exception_breakpoint(plugin, pydb, type, exception):
      return False
  
  def remove_exception_breakpoint(plugin, pydb, type, exception):
      return False
  
  def get_breakpoints(plugin, pydb):
      return None
  
  def can_not_skip(plugin, pydb, pydb_frame, frame):
      return False
  
  def has_exception_breaks(plugin, pydb):
      return False
  
  def cmd_step_into(plugin, pydb, frame, event, args, stop_info):
      return False
  
  def cmd_step_over(plugin, pydb, frame, event, args, stop_info):
      return False
  
  def stop(plugin, pydb, frame, event, args, stop_info, arg, step_cmd):
      return False
  
  def get_breakpoint(plugin, pydb, pydb_frame, frame, event, args):
      return None
  
  def suspend(plugin, pydb, thread, frame):
      return None
  
  def exception_break(plugin, pydb, pydb_frame, frame, args, arg):
      return None
subject: Add trace api module.