一、学生管理系统

studentsystem.py
  

       # coding=utf-8
       """
        作者：gaojs
        功能：
        新增功能：
        日期：2022/4/3 23:41
       """
       import os.path
       filename = 'student.txt'
       def main():
          """
        学生管理系统主函数
        :return:
        """
          while True:
               num()
               choice = int(input('请选择'))
              if choice in [0, 1, 2, 3, 4, 5, 6, 7]:
                  if choice == 0:
                       answer = input('您确定要退出系统吗?y/n')
                      if answer == 'y' or answer == 'Y':
                          print('谢谢您的使用！！！')
                          break
                      else:
                          continue
                  elif choice == 1:
                       insert()
                  elif choice == 2:
                       search()
                  elif choice == 3:
                       delete()
                  elif choice == 4:
                       modify()
                  elif choice == 5:
                       sort()
                  elif choice == 6:
                       total()
                  elif choice == 7:
                       show()
       def num():
          """
        打印功能列表函数
        :return:
        """
          print('========================学生成绩管理系统========================')
          print('---------------------------功能菜单----------------------------')
          print('\t\t\t\t\t\t1.录入学生系统')
          print('\t\t\t\t\t\t2.查找学生系统')
          print('\t\t\t\t\t\t3.删除学生系统')
          print('\t\t\t\t\t\t4.修改学生系统')
          print('\t\t\t\t\t\t5.排序')
          print('\t\t\t\t\t\t6.统计学生总人数')
          print('\t\t\t\t\t\t7.显示所有学生信息')
          print('\t\t\t\t\t\t0.退出')
       def insert():
          """
        1.录入学生信息
        :return:
        """
           student_list = []
          while True:
              id = input('请输入ID(如1001):')
              if not id:
                  break
               name = input('请输入姓名：')
              if not name:
                  break
              try:
                   english = int(input('请输入英语成绩:'))
                   python = int(input('请输入python成绩:'))
                   java = int(input('请输入java成绩:'))
              except Exception as e:
                  print(e)
                  print('输入有误，不是整数类型，请重新输入！')
                  continue
              # 将录入的系统保存到字典
               student = {'id': id, 'name': name, 'english': english, 'python': python, 'java': java}
              # 将学生信息添加到列表中
               student_list.append(student)
               answer = input('是否继续添加y/n\n')
              if answer == 'y' or answer == 'Y':
                  continue
              else:
                  break
              # 保存
           save(student_list)
          print('学生信息录入完毕！！！')
       def save(lst):
          """
        保存学生信息
        :param lst:
        :return:
        """
          try:
               stu_txt = open(filename, 'a', encoding='utf-8')
          except:
               stu_txt = open(filename, 'w', encoding='utf-8')
          for item in lst:
               stu_txt.write(str(item) + '\n')
           stu_txt.close()
       def search():
          """
        2.查找学生数据
        :return:
        """
           student_query = []
          while True:
              id = ''
               name = ''
              if os.path.exists(filename):
                   mode = input('按照ID查找请输入1， 按姓名查找请输入2：')
                  if mode == '1':
                      id = input('请输入学生ID')
                  elif mode == '2':
                       name = input('请输入学生姓名')
                  else:
                      print('输入学生信息不存在，请重新输入！')
                       search()
                  with open(filename, 'r', encoding='utf-8') as f:
                       student = f.readlines()
                      for item in student:
                           d = dict(eval(item))
                          if d['id'] == id:
                               student_query.append(d)
                          elif d['name'] == name:
                               student_query.append(d)
                  # 显示查询结果
                   show_student(student_query)
                  # 清空列表
                   student_query.clear()
                   answer = input('是否要继续查询？y/n\n')
                  if answer == 'y':
                      continue
                  else:
                      break
              else:
                  print('暂未保存学生信息！')
                  return
       def show_student(lst):
          """
        显示学生信息
        :param lst:
        :return:
        """
          if len(lst) == 0:
              print('没有查询到学生信息，无数据显示！！！')
              return
          # 定义标题显示
           format_tltle = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
          print(format_tltle.format('ID', '姓名', '英语成绩', 'python成绩', 'java成绩', '总成绩'))
          # 定义内容的显示格式
           format_data = '{:^6}\t{:^12}\t{:^10}\t{:^10}\t{:^16}\t{:^12}'
          for item in lst:
               print(format_data.format(item.get('id'),
                                         item.get('name'),
                                         item.get('english'),
                                         item.get('python'),
                                         item.get('java'),
                                        int(item.get('english')) + int(item.get('python')) + int(item.get('java'))
                                         ))
       def delete():
          """
        3.删除学生信息
        :return:
        """
          while True:
               student_id = input('请输入要删除学生的ID：')
              if student_id != '':
                  if os.path.exists(filename):
                      with open(filename, 'r', encoding='utf-8') as f:
                           student_old = f.readlines()
                  else:
                       student_old = []
                   flag = False
                  if student_old:
                      with open(filename, 'w', encoding='utf-8') as f:
                          for item in student_old:
                               d = dict(eval(item))# 将字符串转为字典
                              if d['id'] != student_id:
                                   f.write(str(d) + '\n')
                              else:
                                   flag = True
                          if flag:
                              print(f'id为{student_id}的学生信息已被删除')
                          else:
                              print(f'没有找到ID为{student_id}的学生信息')
                  else:
                      print('无学生信息')
                      break
                   show()
                   answer = input('是否继续删除？y/n\n')
                  if answer == 'y' or answer == 'Y':
                      continue
                  else:
                      break
       def modify():
          """
        4.修改学生信息
        :return:
        """
           show()
          if os.path.exists(filename):
              with open(filename, 'r', encoding='utf-8') as f1:
                   student_old = f1.readlines()
          else:
              return
           student_id = input('请输入学生的ID：')
          with open(filename, 'w', encoding='utf-8') as f:
              for item in student_old:
                   d = dict(eval(item))
                  if d['id'] == student_id:
                      print('找到学生信息，可以修改相关信息！')
                      while True:
                          try:
                               d['name'] = input('请输入姓名：')
                               d['english'] = input('请输入英语成绩：')
                               d['python'] = input('请输入python成绩：')
                               d['java'] = input('请输入java成绩：')
                          except Exception as e:
                              print(e)
                              print('您输入的有误，请重新输入：')
                          else:
                              break
                       f.write(str(d) + '\n')
                      print('修改成功')
                  else:
                       f.write(str(d) + '\n')
                      print('没找到学生信息，请重试！')
               answer = input('是否继续修改其他学生信息？y/n\n')
              if answer == 'y' or answer == 'Y':
                   modify()
       def sort():
          """
        排序
        :return:
        """
          pass
       def total():
          """
        6.统计所有学生信息个数：6
        :return:
        """
          if os.path.exists(filename):
              with open(filename, 'r', encoding='utf-8') as f:
                   students= f.readlines()
                  if students:
                      print(f'一共有{len(students)}个学生信息！')
                  else:
                      print('还没有录入学生信息！')
          else:
              print('暂未保存数据！！！')
       def show():
          """
        7.显示所有学生信息
        :return:
        """
           student_list = []
          if os.path.exists(filename):
              with open(filename, 'r', encoding='utf-8') as f:
                   students = f.readlines()
                  for item in students:
                       student_list.append(eval(item))
                  if student_list:
                       show_student(student_list)
          else:
              print('暂未保存过数据！')
       if __name__ == '__main__':
           main()