python10-学生选课系统

创建文件夹注意事项

• Python2.7每个文件夹都有__init__.py文件
• 如果没有这个文件,该文件夹下的文件不能作为模块被其他模块引用
• python3.x可以不需要这个文件

学生选课系统

• 文件夹分类:

  • bin:存放可以执行的文件
  • config:存放配置文件,如:文件的存放路径,配置信息等
  • db:存放持久化数据
  • lib:存放模块文件
    • sys.path中只有bin目录下可执行文件的所在文件夹,需要将lib路径添加到sys.path中
  • log:存放日志,如果大项目的话不建议放在项目中,放在系统的某个文件夹下

• python中的开放封闭原则,代码封闭，配置文件对用户开放

• 把类写在一个module文件下,引入到执行文件中

• 代码片段:

# 程序入口 
if __name__ == '__main__':
    main()

# 把lib文件夹加入sys.path路径
import sys
import os

dirName = os.path.dirname(os.path.dirname(__file__))
path = os.path.join(dirName,'lib')
sys.path.append(path)
from config import conf
from modules import Manager
from modules import Teacher
from modules import Course

# 欢迎界面
def main():
    print('欢迎登陆学生选课系统'.center(80, '-'))
    while True:
        choose = input('1--管理员登陆     2--学生登陆    0--退出系统')
        if choose == '1':
            # 管理员
            manager()
            pass
        elif choose == "2":
            # 学生
            student()
            pass
        elif choose == '0':
            # 退出
            print('成功退出选课系统'.center(80, '-'))
            break
        else:
            # 输入有误
            print('输入有误,请重新输入'.center(80, '-'))

# 管理员操作
def manager():
    print('欢迎进入管理员登陆页面'.center(80, '-'))
    while True:
        choose = loginAndRegister()  # 登陆或注册
        if choose == '3':  # 返回
            break
        elif choose == '2':  # 注册
            userInfo = getUserNameAndPwd()
            userName = userInfo.get('userName')
            pwd = userInfo.get('pwd')
            obj = Manager()
            ret = obj.register(userName, pwd)
            if ret == 0:
                print('注册成功')
            elif ret == 1:
                print('用户已存在')
            pass
        elif choose == '1':  # 登陆
            userInfo = getUserNameAndPwd()
            userName = userInfo.get('userName')
            pwd = userInfo.get('pwd')
            ret = Manager.login(userName, pwd)
            code = ret.get('code')
            obj = ret.get('obj')
            if code == 1:
                print('登陆成功')
                managerToDo(obj)
            elif code == 0:
                print('用户不存在')
            elif code == -1:
                print('密码错误')

# manager类
class Manager():
    def __init__(self):
        self.name = None
        self.pwd = None

    def register(self, name, pwd):
        self.name = name
        self.pwd = pwd
        dir = os.path.dirname(os.path.dirname(__file__))
        dirName = os.path.join(dir, conf.MANAGER_DB_DIR)
        dirExist = os.path.exists(dirName)
        if not dirExist:
            os.makedirs(dirName)
            print('创建%s目录' % conf.MANAGER_DB_DIR)
        path = os.path.join(dirName, self.name)
        isExists = os.path.exists(path)
        if isExists:
            return 1
        else:
            with open(path, mode='wb') as file:
                pickle.dump(self, file)
            return 0

    @staticmethod
    def login(name, pwd):
        dir = os.path.dirname(os.path.dirname(__file__))
        dirName = os.path.join(dir, conf.MANAGER_DB_DIR)
        dirExist = os.path.exists(dirName)
        if not dirExist:
            os.makedirs(dirName)
            print('创建%s目录' % dirName)
        path = os.path.join(dirName, name)
        isExists = os.path.exists(path)
        if isExists:
            with open(path, mode='rb') as file:
                obj = pickle.load(file)
                if obj.name == name and obj.pwd == pwd:
                    return {'code': 1, 'obj': obj}
                else:
                    return {'code': -1, 'obj': None}
        else:
            # 用户不存在
            return {'code': 0, 'obj': None}

# 配置文件
MANAGER_DB_DIR = r'db\manager'
STUDENT_DB_DIR = r'db\student'
TEACHER_DB_DIR = r'db\teacher'
COURSE_DB_DIR = r'db\course'

# 课程类
class Course:
    def __init__(self):
        self.name = None
        self.cost = None
        self.teacher = None
        self.manager = None

    def register(self,name,cost,teacher,manager):
        self.name = name
        self.cost = cost
        self.teacher = teacher
        self.manager = manager
        courseList = []

        dir = os.path.dirname(os.path.dirname(__file__))
        dirName = os.path.join(dir,conf.COURSE_DB_DIR)
        if not os.path.exists(dirName):
            os.makedirs(dirName)
        path = os.path.join(dirName,'courseList')
        if os.path.exists(path):
            with open(path, mode='rb') as file:
                courseList = pickle.load(file)
        flag = False
        ret = "%s&%s"%(self.name,self.cost)
        print(ret)
        for course in courseList:
            if str(course) == ret:
                flag = True
        if flag:
            return 1
        else:
            courseList.append(self)
            with open(path, mode='wb') as file:
                pickle.dump(courseList, file)
            return 0

    def __str__(self):
        ret = "%s&%s"%(self.name,self.cost)
        return ret