code: def p_expr_post_incdec(p):
      '''expr : variable INC
              | variable DEC'''
      p[0] = ast.PostIncDecOp(p[2], p[1], lineno=p.lineno(2)f p_expr_post_incdec(p):
      '''expr : variable INC
              | variable DEC'''
      p[0] = ast.PostIncDecOp(p[2], p[1], lineno=p.lineno(2))
docs: expr : variable INC
              | variable DEC