#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
