docstr: Return a list of the nested symbol tables.
          
code: def get_children(self):
      """Return a list of the nested symbol tables."""
      return [
          _newSymbolTable(st, self._filename)
          for st in self._table.children
      ]
  
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 14 for calling the SymbolTable obj's underlying member method code with example usage: obj.get_children() and returns: unknown