3-13 作业

 1.编写文件copy工具

src_file = input(">>>请输入要拷贝的文件路径：").strip()
copy_file = input(">>>请输入拷贝文件的存放位置：").strip()
with open(r'{}'.format(src_file), 'rt', encoding='utf-8') as f,
        open(r'{}copy.txt'.format(copy_file), 'wt', encoding='utf-8') as copy_f:
    copy = f.read()
    copy_f.write(copy)

while True:
    src_file = input('源文件路径>>: ').strip()
    # 校验源文件路径是否存在
    import os

    if not os.path.exists(src_file):
        print('源文件不存在')
        continue

    dst_file = input('备份路径>>: ').strip()

    with open(r'{}'.format(src_file), mode='rt', encoding='utf-8') as f1, 
            open(r'{}'.format(dst_file), mode='wt', encoding='utf-8') as f2:
        res = f1.read()
        f2.write(res)

2、编写登录程序，账号密码来自于文件

print("登录")
inp_user = input(">>>your name：").strip()
inp_pwd = input(">>>your password：").strip()
with open(r'user.txt', 'rt', encoding='utf-8') as f:
    for line in f:
        user, pwd = line.strip().split(':')
        if user == inp_user and pwd == inp_pwd:
            print('login success')
            break
    else:
        print('用户名或密码错误')

# user_info.txt文件中内容为
'''
tank:123
'''


'''
username = input('请输入用户名: ')
password = input('请输入密码: ')
with open('user_info.txt', 'r', encoding='utf-8') as f:
    user_info = f.read()
    user, pwd = user_info.split(':')

if username == user and password == pwd:
    print('登录成功!')
else:
    print('登录失败!')
'''

3、编写注册程序，账号密码来存入文件

print("注册")
inp_user = input(">>>your name：").strip()
inp_pwd = input(">>>your password：").strip()
with open(r'user.txt', 'at', encoding='utf-8') as f:
    f.write('{user}:{pwd}
'.format(user=inp_user, pwd=inp_pwd))

周末作业

# #二：周末综合作业：
# # 2.1：编写用户登录接口
# #1、输入账号密码完成验证，验证通过后输出"登录成功"
# user_info2.txt文件中
'''  ---- user_info2.txt文件中数据 ----
tank:123

'''
# 答案
'''
while True:
    username = input('请输入用户名: ').strip()
    password = input('请输入密码: ').strip()
    with open('user_info2.txt', 'r', encoding='utf-8') as f:
        user, pwd = f.read().strip().split(':')
        if username == user and password == pwd:
            print('登录成功!')
            break
        else:
            print('用户名或密码错误!')
'''

# #2、可以登录不同的用户
'''  ---- user_info3.txt文件中数据 ----
tank:123
egon:321

'''
# 答案
'''
tag = True
while tag:
    username = input('请输入用户名: ').strip()
    with open('user_info3.txt', 'r', encoding='utf-8') as f:
        for line in f:
            user, pwd = line.strip().split(':')
            # print(user, pwd)
            if username == user:
                password = input('请输入密码: ').strip()
                if password == pwd:
                    print('登录成功!')
                    tag = False
                    break
                else:
                    print('密码错误!')
'''

# #3、同一账号输错三次锁定，（提示：锁定的用户存入文件中，这样才能保证程序关闭后，该用户仍然被锁定）
'''  ---- user_info4.txt文件中数据 ----
tank:123:0
egon:321:0

'''
# 答案
'''
tag = True
while tag:
    username = input('请输入用户名: ').strip()
    with open('user_info4.txt', 'r', encoding='utf-8') as f, open('user_info5.txt', 'w', encoding='utf-8') as w:
        for line in f:
            user, pwd, locked = line.strip().split(':')
            # print(user, pwd, type(locked))
            locked = int(locked)

            if locked == 3:
                print('当前用户已被锁定')

            if username == user:
                while locked < 3:
                    password = input('请输入密码: ').strip()
                    if password == pwd:
                        print('登录成功!')
                        tag = False
                        break
                    else:
                        print('密码错误!')
                        locked += 1

            w.write(f'{user}:{pwd}:{locked}
')

    import os
    os.remove('user_info4.txt')
    # 将user_info5.txt修改为user_info4.txt
    os.rename('user_info5.txt', 'user_info4.txt')
'''

# # 2.2：编写程序实现用户注册后，可以登录，
# 提示：
# while True:
#     msg = """
#     0 退出
#     1 登录
#     2 注册
#     """
#     print(msg)
#     cmd = input('请输入命令编号>>: ').strip()
#     if not cmd.isdigit():
#         print('必须输入命令编号的数字，傻叉')
#         continue
#
#     if cmd == '0':
#         break
#     elif cmd == '1':
#         # 登录功能代码（附加：可以把之前的循环嵌套，三次输错退出引入过来）
#         pass
#     elif cmd == '2':
#         # 注册功能代码
#         pass
#     else:
#         print('输入的命令不存在')

# 思考：上述这个if分支的功能否使用其他更为优美地方式实现
'''
dic = {
    '0': '退出',
    '1': '登录',
    '2': '注册',
}
while True:
    msg = """
    0 退出
    1 登录
    2 注册
    """
    print(msg)
    cmd = input('请输入命令编号>>: ').strip()
    if not cmd.isdigit():
        print('必须输入命令编号的数字，傻叉')
        continue

    if cmd not in dic:
        print('输入有误')
        continue

    print(dic.get(cmd))
'''