# 1、编写文件修改功能，调用函数时，传入三个参数（修改的文件路径，要修改的内容，修改后的内容）既可完成文件的修改
"""
def revise_file(file_path,change_content,data):
"""对文件内容时行修改"""
with open(file_path,"r",encoding="utf-8") as f:
info = f.read()
info = info.replace(change_content,data)
with open(file_path,"w",encoding="utf-8") as f:
f.write()
"""
# 2、编写tail工具
"""
import time
def tail():
with open("access.log","rb") as f:
f.seek(0,2) #将指针跳到未尾while True:
line = f.readline()
if len(line) == 0:
time.sleep(0.3)
else:
print(line.decode("utf-8"),end=" ")
tail()
"""
# 3、编写登录功能
# 让用户输入账号和密码，并格试化方试打印出来
"""
def log_system():
username = input("your name:")
password = input("your pwd:")
print(f"用户的账号密码是:{username}{password}")
# 打开文件user.txt校验用户信息with open("user.txt", "r", encoding="utf-8") as f:
# content = f.read()
for line in f:
user, pwd = line.strip().split(":")
# 判断用户登录信息if username == user and password == pwd:
print("login sucessful")
break
else:
print('login failed')
break
log_system()
"""
# 4、编写注册功能
"""
def rejister():
#用户输入账户和密码while True:
username = input("your name:")
password = input("your pwd:")
#打开文件校验追加用户信息with open(r"user.txt","a",encoding="utf-8") as f:
f.write("{}:{}\n".format(username,password))
rejister()
"""
