实现简单的从文件读取和写入学生信息的项目

#encoding = 'UTF-8'
'''
    @author:xianyt
    @func:实现简单的从文件读取和写入学生信息的项目
   @date:2018/8/21
'''
with open('stu.txt', 'r') as f:   #取出文件内容
    student_list = f.read()

if student_list=='':
    student_list=[]
else:
    student_list = eval(student_list)



def add_student():
    #添加
    name = input('请输入新学员姓名：')
    age= input('请输入新学员年龄：')
    number= input('请输入新学员学号：')
    student_list.append(locals())
    with open('stu.txt','w+') as f:
        f.write(str(student_list))    #文件写入只能写入字符和二进制编码



def find_student():
    #查询
    f_number=input('请输入要查询的学号：')
    for student in student_list:
        if student['number']==f_number:
            print('找到了，信息如下：姓名:{},年龄：{}，学号：{}'.format(student['name'],student['age'],student['number']))
            break
        else:
            print('没找到')

def update_student():
    # 修改
    f_number = input('请输入要修改的学生学号：')
    for student in student_list:
        if student['number']==f_number:
            new_name=input('请输入修改后的名字：')
            new_age = input('请输入修改后的年龄：')
            student['name']=new_name
            student['age']=new_age
            with open('stu.txt','w+') as f:
                f.write(str(student_list))
            break
        else:
            print('班级里没有这个学号的人')



def del_student():
    # 删除
    f_number = input('请输入要删除的学生学号：')
    for student in student_list:
        if student['number']==f_number:
            student_list.remove(student)
            with open('stu.txt',"w+") as f:
                f.write(str(student_list))
            break
        else:
            print('班级里没有这个学号的人')


def student_main():
    print('''
    =====欢迎进入学生信息管理系统=====
    1.添加学员信息
    2.查询学员信息
    3.修改学员信息
    4.删除学员信息
    5.退出
    ''')

while True:
    num = int(input('请选择功能：'))
    if num == 1:
        add_student()
    elif num == 2:
        find_student()
    elif num == 3:
        update_student()
    elif num == 4:
        del_student()
    elif num == 5:
        break
    else:
        print('输入有误，请重新输入')


student_main()