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import os.path # 导入os.path模块
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def menm(): # 菜单
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print('==========================学生信息管理系统==========================')
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print('------------------------------请选择如下功能-----------------------------')
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print('\t\t\t 1.添加学员')
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print('\t\t\t 2.删除学员')
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print('\t\t\t 3.修改学员信息')
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print('\t\t\t 4.查询学员信息')
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print('\t\t\t 5.显示所有学员信息')
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print('\t\t\t 6.保存学员信息')
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print('\t\t\t 7.退出系统')
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print('-------------------------------------------------------------------')
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filename = 'student.txt' # 文件名
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def main(): # 主程序
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while True:
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menm() # 调用菜单函数
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choice = int(input('请选择'))
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if choice in [0, 1, 2, 3, 4, 5, 6, 7]:
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if choice ==7:
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answer = input('您确定要退出系统吗？y/n')
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if answer == 'y' or answer == 'Y':
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print('谢谢您的使用！！!')
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break # 退出系统
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else:
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continue
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elif choice == 1:
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insert()
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elif choice == 2:
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search()
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elif choice == 3:
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delete()
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elif choice == 4:
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modify()
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elif choice == 5:
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sort()
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elif choice == 6:
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total()
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elif choice == 7:
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show()
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def insert(): # 插入信息
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student_list = []
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while True: # 循环输入
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id = input('请输入ID(如1001)：')
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if not id: # 防止手滑
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break
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name = input('请输入姓名：')
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if not name:
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break
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try:
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english = int(input('请输入英语成绩：'))
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python = int(input('请输入python成绩：'))
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java = int(input('请输入Java成绩：'))
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except:
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print('输入无效，不是整数类型，请重新输入')
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continue
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# 将录入的学生信息保存到字典当中
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student = {'id': id, 'name': name, 'english': english, 'python': python, 'java': java}
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# 将学生信息添加到列表中
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student_list.append(student)
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answer = input('是否继续添加？y/n\n')
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if answer == 'y':
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continue
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else:
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break
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# 调用save（）函数
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save(student_list)
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print('学生信息录入完毕！！！')
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def save(lst): # 保存
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try:
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stu_txt = open(filename, 'a', encoding='utf-8')
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except:
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stu_txt = open(filename, 'w', encoding='utf-8')
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for item in lst:
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stu_txt.write(str(item) + '\n') # 将内容写入文件中
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def search(): # 搜索
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student_query = []
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while True:
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id = ''
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name = ''
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if os.path.exists(filename): # 如果可以打开文件
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mode = input('按ID查找请输入1，按姓名查找请输入2：')
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if mode == '1':
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id = input('请输入要查询的学生ID：')
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elif mode == '2':
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name = input('请输入学生姓名：')
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else:
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print('您的输入有误，请重新输入')
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search()
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with open(filename, 'r', encoding='utf-8') as rfile:
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student = rfile.readlines()
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for item in student:
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d = dict(eval(item))
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if id != '':
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if d['id'] == id:
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student_query.append(d)
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elif name != '':
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if d['name'] == name:
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student_query.append(d)
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# 显示查询结果
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show_student(student_query)
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# 清空列表
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student_query.clear()
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answer = input('是否要继续查询？y/n\n')
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if answer == 'y':
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continue
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else:
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break
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else:
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print('暂未保存学生信息')
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return
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def show_student(lst):
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if len(lst) == 0:
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print('没有查询到学生信息，无数据显示！！！')
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return
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# 定义标题显示格式
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format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
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print(format_title.format('ID', '姓名', '英语成绩', 'python成绩', 'java成绩', '总成绩'))
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# 定义内容的显示格式
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format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
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for item in lst:
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print(format_data.format(item.get('id'),
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item.get('name'),
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item.get('english'),
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item.get('python'),
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item.get('java'),
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int(item.get('english')) + int(item.get('python')) + int(item.get('java'))
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))
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def delete():
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while True:
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student_id = input('请输入要删除的学生的ID:')
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if student_id != '':
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if os.path.exists(filename):
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with open(filename, 'r', encoding='utf-8') as file:
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student_old = file.readlines()
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else:
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student_old = []
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flag = False # 标记是否删除
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if student_old:
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with open(filename, 'w', encoding='utf-8') as wfile:
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d = {}
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for item in student_old:
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d = dict(eval(item)) # 将字符串转成字典
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if d['id'] != student_id:
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wfile.write(str(d) + '\n')
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else:
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flag = True
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if flag:
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print(f'id为{student_id}的学生信息已被删除')
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else:
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print(f'没有找到ID为{student_id}的学生信息')
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else:
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print('无学生信息')
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break
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show() # 删除之后要重新显示所有学生信息
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answer = input('是否继续删除？y/n\n')
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if answer == 'y':
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continue
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else:
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break
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def modify():
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show()
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if os.path.exists(filename):
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with open(filename, 'r', encoding='utf-8') as rfile:
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student_old = rfile.readlines()
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else:
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return
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student_id = input('请输入要修改的学员的ID：')
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with open(filename, 'w', encoding='utf-8') as wfile:
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for item in student_old:
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d = dict(eval(item))
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if d['id'] == student_id:
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print('找到学生信息，可以修改他的相关信息了！')
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while True:
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try:
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d['name'] = input('请输入姓名：')
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d['english'] = input('请输入英语成绩：')
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d['python'] = input('请输入Python成绩：')
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d['java'] = input('请输入java成绩：')
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except:
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print('您的输入有误，请重新输入！！！')
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else:
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break
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wfile.write(str(d) + '\n')
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print('修改成功!!！')
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else:
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wfile.write(str(d) + '\n')
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answer = input('是否继续修改其他学生信息呢？y/n\n')
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if answer == 'y':
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modify()
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def sort():
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show()
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if os.path.exists(filename):
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with open(filename, 'r', encoding='utf-8') as rfile:
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student_list = rfile.readlines()
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student_new = []
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for item in student_list:
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d = dict(eval(item))
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student_new.append(d)
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else:
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return
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asc_or_desc = input('请选择（0.升序 1.降序:）')
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if asc_or_desc == '0':
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asc_or_desc_bool = False
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elif asc_or_desc == '1':
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asc_or_desc_bool = True
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else:
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print('您的输入有误，请重新输入')
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sort()
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mode = input('请选择排序方式（1.按英语成绩排序 2.按python成绩排序 3.按java成绩排序 0.按总成绩排序）：')
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if mode == '1':
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student_new.sort(key=lambda x: int(x['english']), reverse=asc_or_desc_bool)
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elif mode == '2':
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student_new.sort(key=lambda x: int(x['python']), reverse=asc_or_desc_bool)
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elif mode == '3':
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student_new.sort(key=lambda x: int(x['java']), reverse=asc_or_desc_bool)
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elif mode == '0':
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student_new.sort(key=lambda x: int(x['english']) + int(x['python']) + int(x['java']), reverse=asc_or_desc_bool)
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else:
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print('您的输入有误，请重新输入！！！')
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sort()
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show_student(student_new)
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def total():
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if os.path.exists(filename):
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with open(filename, 'r', encoding='utf-8') as rfile:
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students = rfile.readlines()
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if students:
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print(f'一共有{len(students)}名学生')
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else:
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print('还未录入学生信息')
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else:
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print('暂未保存数据信息......')
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def show():
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student_lst = []
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if os.path.exists(filename):
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with open(filename, 'r', encoding='utf-8') as rfile:
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students = rfile.readlines()
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for item in students:
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student_lst.append(eval(item))
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if student_lst:
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show_student(student_lst)
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else:
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print('暂未保存过数据！！！')
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if __name__ == '__main__':
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main()
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