code: def check_valid_char(self, p):
      name = p["name"]
      return """
      self->{name} = {defval};
      if ({name} != NULL) {{
          self->{name} = {name};
      }}
  """.format(
          defval=aubiodefvalue[name], name=name
      )
  
label_desc: Use image node_id 8 for calling the MappedObject obj's underlying member method code with example usage: obj.check_valid_char(p) and returns: str