docstr: Return a tuple of methods declared in the class.
          
code: def get_methods(self):
      """Return a tuple of methods declared in the class."""
      if self.__methods is None:
          d = {}
          for st in self._table.children:
              d[st.name] = 1
          self.__methods = tuple(d)
      return self.__methods
  
imports: import _symtable
  from _symtable import USE, DEF_GLOBAL, DEF_NONLOCAL, DEF_LOCAL, DEF_PARAM, DEF_IMPORT, DEF_BOUND, DEF_ANNOT, SCOPE_OFF, SCOPE_MASK, FREE, LOCAL, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT, CELL
  import weakref
label_desc: Use image node_id 1 for calling the Class obj's underlying member method code with example usage: obj.get_methods() and returns: self