1、编写文件copy工具
src_file = input("输入文件路径:").strip()
new_file = input("输入新文件路径:").strip()
with open(f'{src_file}', mode="rt", encoding="utf-8") as f1, \
open(f'{new_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
name = input("请输入账号:").strip()
password = input("请输入密码:").strip()
with open("username.txt", mode="rt", encoding="utf-8") as f:
for i in f:
username, userpassword = i.strip().split(":")
if username == name and userpassword == password:
print("密码正确，登录成功")
break
else:
print("账号或密码错误，登陆失败")
3、编写注册程序，账号密码来存入文件
print('用 户 注 册')
for i in range(3):
name = input("输入账号\n ").strip()
password = input("输入密码\n ").strip()
if name == password:
print('账号与密码相同，注册失败')
else:
print('注册成功')
with open("username.txt", mode="at", encoding="utf-8") as f:
f.write(f'{name}:{password}\n')
break
