python实现简易版学生成绩管理系统


Posted in Python onJune 22, 2020

300来行python代码实现简易版学生成绩管理系统,供大家参考,具体内容如下

使用链表来实现

class Node(object):
 def __init__(self, data, pointer):
 self.data = data
 self.next = pointer


# 创建单链表
class SingleLinkedList(object):
 def __init__(self):
 self.head = Node(None, None)
 self.point = self.head

 def append(self, data):
 # 末尾追加节点
 new_node = Node(data, None)
 self.point.next = new_node
 self.point = new_node

 def insert(self, data, find):
 # 插入数据(前向插入数据)
 if not self.head.next:
  print('链表为空')
  return None
 new_node = Node(data, None)
 self.point = self.head
 while self.point.next.data != find:
  self.point = self.point.next
  if self.point.next is None:
  print('没有找到该元素')
  return None

 new_node.next = self.point.next
 self.point.next = new_node

 def delete(self, find):
 # 删除节点
 # 空链表
 if not self.head.next:
  print('链表为空')
  return None
 self.point = self.head
 while self.point.next.data != find:
  self.point = self.point.next
 pointer = self.point.next
 self.point.next = self.point.next.next
 del pointer

 def insert_after_head(self, data):

 node = Node(data, None)
 # bug 产生没写 if 返回
 if not self.head.next:
  self.head.next = node
  return None
 node.next = self.head.next
 self.head.next = node

 def reverse(self):
 local_list = SingleLinkedList()
 self.point = self.head
 count = 0
 while self.point.next:
  count += 1
  self.point = self.point.next
  data = self.point.data
  local_list.insert_after_head(data)
 return local_list

 def get_size(self):
 count = 0
 self.point = self.head
 while self.point.next:
  self.point = self.point.next
  count += 1
 return count

 def delete_by_tail(self, num):
 size = self.get_size()
 assert (num <= size)
 assert (num > 0)
 pos = size - num
 count = 0
 self.point = self.head
 while count < size:
  count += 1
  self.point = self.point.next
  if count == pos:
  pointer = self.point.next
  self.point.next = self.point.next.next
  del pointer

 # 求中间节点 只允许遍历一次
 def quick_middle(self):
 slow_point = self.head
 fast_point = self.head
 while fast_point.next.next:
  slow_point = slow_point.next
  fast_point = fast_point.next.next
  if not fast_point.next:
  break
 if fast_point.next:
  slow_point = slow_point.next
 return slow_point.data

 def check_circle(self):
 pass

 def sort(self):
 # get_size()改变了 self.point 的指向
 length = self.get_size()
 i, j = 0, 0
 flag = 1
 while i < length:
  self.point = self.head.next
  while j < length - i - 1:
  if self.point.data > self.point.next.data:
   temp = self.point.data
   self.point.data = self.point.next.data
   self.point.next.data = temp
  self.point = self.point.next
  j += 1
  flag = 0
  if flag:
  break
  i += 1
  j = 0

 def print(self):
 # 打印结点
 self.point = self.head
 while self.point.next:
  self.point = self.point.next
  print('{} ->'.format(self.point.data), end=' ')
 print('')


class StudentControlSystem(SingleLinkedList):
 # 打印菜单
 def print_menu(self):
 print('*' * 30)
 print('-' * 13 + '菜单' + '-' * 13)
 print('1.增加学生信息')
 print('2.删除学生信息')
 print('3.修改学生信息')
 print('4.查找学生信息')
 print('5.显示所有信息')
 print('6.排序')
 print('0.退出程序')
 print('*' * 30)

 # 用户输入
 def user_input(self, item):
 try:
  item = int(item)
 except:
  pass
 # 增加信息
 if item == 1:
  self.add_info()
 # 删除信息
 elif item == 2:
  find = input('请输入删除的学号:')
  self.del_info(find=find)
 # 修改信息
 elif item == 3:
  self.modify_info()
 # 查找信息
 elif item == 4:
  self.search_info()
 # 显示信息
 elif item == 5:
  self.display_info()
 # 信息排序
 elif item == 6:
  self.rank_info()
 # 退出程序 保存数据
 elif item == 0:
  with open('database.txt', 'w') as f:
  self.point = self.head
  while self.point.next:
   self.point = self.point.next
   f.writelines('{}\n'.format(self.point.data))
  exit()
 else:
  print('请输入正确的数字')

 # id 保证互异性
 def unique_id(self, std_id):
 self.point = self.head
 while self.point.next:
  self.point = self.point.next
  if self.point.data['id'] == std_id:
  return False
 return True

 # 增加信息
 def add_info(self):
 # id 不能重复
 # 成绩不能超出范围
 name = input('姓名:')
 std_id = input('学生id:')
 while not self.unique_id(std_id=std_id):
  print('id重复')
  std_id = input('学生id:')
 grade = input('学生成绩:')
 if eval(grade) < 0 or eval(grade) > 100:
  print('超出范围')
  grade = input('学生成绩:')
 print(name, std_id, grade)
 print('请确认无误后保存')
 choice = input('y/n')
 items = ['y', 'yes', 'Y', 'Yes']
 if choice in items:
  print(choice)
  data = {'id': std_id, 'name': name, 'grade': grade}
  self.append(data)

 # 删除信息
 def del_info(self, find):
 print('请确认无误后保存')
 choice = input('y/n')
 items = ['y', 'yes', 'Y', 'Yes']
 if choice in items:
  if not self.head.next:
  print('链表为空')
  return None
  self.point = self.head
  while self.point.next.data['id'] != find:
  self.point = self.point.next
  pointer = self.point.next
  self.point.next = self.point.next.next
  del pointer

 # 序列逆序
 def reverse(self):
 local_list = StudentControlSystem()
 self.point = self.head
 count = 0
 while self.point.next:
  count += 1
  self.point = self.point.next
  data = self.point.data
  local_list.insert_after_head(data)
 return local_list

 # 序列排序
 def sort(self, item):
 length = self.get_size()
 i, j = 0, 0
 flag = 1
 while i < length:
  self.point = self.head.next
  while j < length - i - 1:
  if int(self.point.data[item]) > int(self.point.next.data[item]):
   # self.point.data, self.point.next.data =
   # self.point.next.data, self.point.data
   temp = self.point.data
   self.point.data = self.point.next.data
   self.point.next.data = temp
  self.point = self.point.next
  j += 1
  flag = 0
  if flag:
  break
  i += 1
  j = 0

 # 修改信息
 def modify_info(self):
 find = input('输入需要修改的学生的id:')
 if not self.head.next:
  print('链表为空')
  return None
 self.point = self.head
 while str(self.point.next.data['id']) != find:
  self.point = self.point.next
  if self.point.next is None:
  print('没有找到该元素')
  return None
 name = input('姓名:')
 grade = input('学生成绩:')
 self.point.next.data['name'] = name
 self.point.next.data['grade'] = grade

 # 搜索信息
 def search_info(self):
 find = input('输入需要查找的学生的id:')
 if not self.head.next:
  print('链表为空')
  return None
 self.point = self.head
 while str(self.point.next.data['id']) != find:
  self.point = self.point.next
  if self.point.next is None:
  print('没有找到该元素')
  return None
 data = self.point.next.data
 print('ID 姓名 成绩')
 print('{} {} {}'.format(data['id'], data['name'], data['grade']))

 # 信息排序
 def rank_info(self):
 choice = input('1.成绩排序 2.学号排序:')
 order = input('1.升序 2.降序:')
 if choice == '1':
  item = 'grade'
 elif choice == '2':
  item = 'id'
 else:
  return None
 self.sort(item=item)
 if order == '2':
  temp = self.reverse()
  temp.display_info()
  return None
 self.display_info()

 # 显示信息
 def display_info(self):
 self.point = self.head
 print('ID 姓名 成绩')
 while self.point.next:
  self.point = self.point.next
  data = self.point.data
  print('{} {} {}'.format(data['id'], data['name'], data['grade']))
 print('')


def main():
 SCS = StudentControlSystem()
 try:
 with open('database.txt', 'r') as f:
  for data in f.readlines():
  SCS.append(eval(data))
 except:
 with open('database.txt', 'w') as f:
  pass

 while True:
 SCS.print_menu()
 item = input('请输入你的选择:')
 SCS.user_input(item)


if __name__ == "__main__":
 main()

运行后

python实现简易版学生成绩管理系统

然后就可以插入与查询啦

更多学习资料请关注专题《管理系统开发》。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持三水点靠木。

Python 相关文章推荐
下载安装setuptool和pip linux安装pip    
Jan 24 Python
跟老齐学Python之用while来循环
Oct 02 Python
Python的SQLalchemy模块连接与操作MySQL的基础示例
Jul 11 Python
Python之re操作方法(详解)
Jun 14 Python
Python下实现的RSA加密/解密及签名/验证功能示例
Jul 17 Python
numpy数组拼接简单示例
Dec 15 Python
python如何去除字符串中不想要的字符
Jul 05 Python
Django 接收Post请求数据,并保存到数据库的实现方法
Jul 12 Python
Python接口测试get请求过程详解
Feb 28 Python
python selenium xpath定位操作
Sep 01 Python
python实现网络五子棋
Apr 11 Python
pytorch fine-tune 预训练的模型操作
Jun 03 Python
python能否java成为主流语言吗
Jun 22 #Python
python让函数不返回结果的方法
Jun 22 #Python
python实现学生成绩测评系统
Jun 22 #Python
python算的上脚本语言吗
Jun 22 #Python
Python读取二进制文件代码方法解析
Jun 22 #Python
怎么快速自学python
Jun 22 #Python
关于python的缩进规则的知识点详解
Jun 22 #Python
You might like
PHP求小于1000的所有水仙花数的代码
2012/01/10 PHP
php自动加载autoload机制示例分享
2014/02/20 PHP
PHP答题类应用接口实例
2015/02/09 PHP
PHP register_shutdown_function()函数的使用示例
2015/06/23 PHP
php is_executable判断给定文件名是否可执行实例
2016/09/26 PHP
Json_decode 解析json字符串为NULL的解决方法(必看)
2017/02/17 PHP
JQuery 选项卡效果(JS与HTML的分离)
2010/04/01 Javascript
收集的10个免费的jQuery相册
2011/02/26 Javascript
jquery动态增加text元素以及删除文本内容实例代码
2013/07/01 Javascript
判断一个变量是数组Array类型的方法
2013/09/16 Javascript
js操作输入框提示信息且响应鼠标事件
2014/03/25 Javascript
javascript实现简单的ajax封装示例
2016/12/28 Javascript
详解如何使用webpack+es6开发angular1.x
2017/08/16 Javascript
基于react组件之间的参数传递(详解)
2017/09/05 Javascript
使用vue官方提供的模板vue-cli搭建一个helloWorld案例分析
2018/01/16 Javascript
使用JavaScript破解web
2018/09/28 Javascript
vue实现动态显示与隐藏底部导航的方法分析
2019/02/11 Javascript
在微信小程序中使用图表的方法示例
2019/04/25 Javascript
微信小程序实现折线图的示例代码
2019/06/07 Javascript
scrapyd schedule.json setting 传入多个值问题
2019/08/07 Javascript
vue 清空input标签 中file的值操作
2020/07/21 Javascript
浅谈JavaScript中this的指向问题
2020/07/28 Javascript
解决出现Incorrect integer value: '' for column 'id' at row 1的问题
2017/10/29 Python
python实现外卖信息管理系统
2018/01/11 Python
python TCP Socket的粘包和分包的处理详解
2018/02/09 Python
python3+selenium获取页面加载的所有静态资源文件链接操作
2020/05/04 Python
Python基于yaml文件配置logging日志过程解析
2020/06/23 Python
如何教少儿学习Python编程
2020/07/10 Python
印度网上购物首选目的地:Flipkart
2016/08/01 全球购物
Camper鞋西班牙官方网上商店:西班牙马略卡岛的鞋类品牌
2019/03/14 全球购物
Audible英国:有声读物,30天免费试用
2019/10/16 全球购物
优秀干部获奖感言
2014/01/31 职场文书
2015年全国爱眼日活动小结
2015/02/27 职场文书
2015年志愿者服务工作总结
2015/04/20 职场文书
答谢酒会主持词
2015/07/02 职场文书
Element-ui Layout布局(Row和Col组件)的实现
2021/12/06 Vue.js