猜想与反驳

摘要： mysite/feed/models.py#!/usr/bin/python# -*- coding: utf-8 -*-from django.db import modelsfrom django.db.models import F class Account(models.Model): """ 账户""" balance = models.DecimalField('余额', max_digits=19, decimal_places=4) version = models.IntegerField(' 阅读全文