2.2

# -*- coding:utf-8 -*-
#输入用户名密码，正确登录，打印信息，可修改，存回文件

def print_user_info(account_dic,username):
    person_info = account_dic[username]
    msg = ''' 
    Name:  %s
    Age:   %s
    Job:   %s
    Dept:  %s
    Phone: %s
    ''' % (person_info[2],
           person_info[3],
           person_info[4],
           person_info[5],
           person_info[6])
    print(msg)

def save_back_to_file(account_dic):
    f.seek(0)
    f.truncate()
    for line in account_dic:
        row = ','.join(account_dic[line])
        f.write('%s
' % row)
    f.flush()

def update_user_info(account_dic,username):
    person_info = account_dic[username]
    print('old data：', person_info)
    str = ['Username','Password','Name','Age','Job','Dept','Phone']
    for index, i in enumerate(person_info):
        if index > 1:   #用户名 密码 不显示
            print('%s. %s:  %s' % (index, str[index], i))
    choice = input('select column id to change >>>:').strip()
    if choice.isdigit():
        choice = int(choice)
        if choice > 1 and choice < len(person_info):
            print('current value:', person_info[choice])
            new_val = input('new value:').strip()
            if new_val: #不为空
                person_info[choice] = new_val
                print('new data:', person_info)
                save_back_to_file(account_dic)
            else:
                print('不能为空！')


f = open('account.txt', 'r+', encoding='utf-8')
data = f.readlines()
# print(data)
account_dic = {}

for i in data:
    items = i.replace(' ', '').split(',')
    account_dic[items[0]] = items   # 将文件读出来存到字典形式中
# print(account_dic)

msg = '''
1.打印个人信息
2.修改个人信息
'''

count = 0
while count < 3:
    username = input('Username:').strip()
    password = input('Password:').strip()
    if username in account_dic:
        if password == account_dic[username][1]:
            print('welcome %s '.center(50,'-') % username)
            while True:
                print(msg)
                user_choice = input('>>>:').strip()
                if user_choice.isdigit():
                    user_choice = int(user_choice)
                    if user_choice == 1:
                        print_user_info(account_dic,username)
                    elif user_choice == 2:
                        update_user_info(account_dic,username)

                elif user_choice == 'q':
                    exit('bye bye')
        else:
            print('Wrong Username or password')
    else:
        print('Username dose not exist')
    count += 1
else:
    print('Too many attempts')
f.close()

附：account.txt

alice,123,静静,12,Model,IT,123456789
alex,123,李杰,40,CEO,IT,123456789
rain,123,王雨,27,Engineer,IT,123456789