code: def p_else_single(p):
      '''else_single : empty
                     | ELSE statement'''
      if len(p) == 3:
          p[0] = ast.Else(p[2], lineno=p.lineno(1)f p_else_single(p):
      '''else_single : empty
                     | ELSE statement'''
      if len(p) == 3:
          p[0] = ast.Else(p[2], lineno=p.lineno(1))
docs: else_single : empty
                     | ELSE statement