python-基础day8

#文件的读取
#只读：
# f = open('d:\python学习\练习\day07\cc.txt',mode='r',encoding='utf-8') #绝对路径
# content = f.read()
# print(content)
# f.close()
# f = open('cc.txt',mode='r',encoding='utf-8') #相对路径 "r"为只读
# content = f.read()
# print(content)
# f.close()
# f = open('cc.txt',mode='rb',encoding='utf-8')  # "rb"为上传下载
# content = f.read()
# print(content)
# f.close()
#对于w:没有此文件创建文件
# f=open('log',mode='w',encoding='utf-8')
# f.write('到此一游')
#追加：
# f = open('log',mode='a',encoding='utf-8')
# f.write('你好')
#读写:
f = open('log',mode='r+',encoding='utf-8')
print(f.read())
f.seek(3) #是按照字节定光标位置
f.tell() #告诉你光标位置
f.write('hello')
f.readline() #读取一行
f.readlines() #读取多行

username=input("请输入用户名:")
password=input("请输入密码:")
with open('user',mode='w',encoding='utf-8') as f:
    f.write("{}\n{}".format(username,password))
print("恭喜您注册成功")
lis=[]
i=0
while i<3:
    usn=input("请输入用户名:")
    psd=input("请输入密码:")
    with open('user',mode='r',encoding='utf-8') as f1:
        for line in f1:
            lis.append(line)
        if usn==lis[0].strip() and psd==lis[1].strip():
            print("登陆成功")
        else:
            print("账号密码错误")
        i+=1