Python笔记day08（基础）
1，文件操作。
模特主妇护士老师.txt
1,文件路径：d:\模特主妇护士老师.txt
2,编码方式：utf-8 gbk 。。。。
3，操作方式：只读，只写，追加，读写，写读…..
以什么编码方式储存的文件，就以什么编码打开进行操作。
只读：r rb
f = open('模特主妇护士班主任',mode='r',encoding='utf-8')
content = f.read()
print(content,type(content))
f.close()
# f = open('模特主妇护士班主任',mode='rb',)
# content = f.read()
# print(content)
# f.close()r+ 读写
r+b 读写（以bytes类型）
# f = open('log',mode='r+',encoding='utf-8')
# print(f.read())
# f.write('大猛，小孟')
# f.close()
f = open('log',mode='r+b')
print(f.read())
f.write('大猛，小孟'.encode('utf-8'))
f.close()只写：w wb
# 先将源文件的内容全部清除，在写。
# f = open('log',mode='w',encoding='utf-8')
# f.write('附近看到类似纠纷')
# f.close()
f = open('log',mode='wb')
f.write('附近看到类似纠纷'.encode('utf-8'))
f.close()
# w+
# f = open('log',mode='w+',encoding='utf-8')
# f.write('aaa')
# f.seek(0)
# print(f.read())
# f.close()
追加
# f = open('log',mode='a',encoding='utf-8')
# f.write('佳琪')
# f.close()
# f = open('log',mode='ab')
# f.write('佳琪'.encode('utf-8'))
# f.close()文件操作代码
#绝对路径
# f = open('d:\模特主妇护士班主任.txt',mode='r',encoding='UTF-8')
# content = f.read()
# print(content)
# f.close()
#bytes ---->str
# f = open('模特主妇护士班主任',mode='r',encoding='utf-8')
# content = f.read()
# f.write('fjsdlk')
# f.close()
# f = open('模特主妇护士班主任',mode='rb',)
# content = f.read()
# print(content)
# f.close()
# f = open('log',mode='r+',encoding='utf-8')
# print(f.read())
# f.close()
# f = open('log',mode='r+b')
# print(f.read())
# f.write('大猛，小孟'.encode('utf-8'))
# f.close()
#对于w:没有此文件就会创建文件
# f = open('log',mode='w',encoding='utf-8')
# f.write('骑兵步兵')
# f.close()
# 先将源文件的内容全部清除，在写。
# f = open('log',mode='w',encoding='utf-8')
# f.write('附近看到类似纠纷')
# f.close()
# f = open('log',mode='w+',encoding='utf-8')
# f.write('aaa')
# f.seek(0)
# print(f.read())
# f.close()
# f = open('log',mode='wb')
# f.write('附近看到类似纠纷'.encode('utf-8'))
# f.close()
# f = open('log',mode='a',encoding='utf-8')
# f.write('佳琪')
# f.close()
#
# f = open('log',mode='a',encoding='utf-8')
# f.write('佳琪')
# f.close()
# f = open('log',mode='a+',encoding='utf-8')
# f.write('佳琪')
# f.seek(0)
# print(f.read())
# f.close()
# f = open('log',mode='ab')
# f.write('佳琪'.encode('utf-8'))
# f.close()
#功能详解
# obj = open('log',mode='r+',encoding='utf-8')
# content = f.read(3) # 读出来的都是字符
# f.seek(3) # 是按照字节定光标的位置
# f.tell() 告诉你光标的位置
# print(f.tell())
# content = f.read()
# print(content)
# f.tell()
# f.readable() # 是否刻度
# line = f.readline() # 一行一行的读
# line = f.readlines() # 每一行当成列表中的一个元素，添加到list中
# f.truncate(4)
# for line in f:
# print(line)
# f.close()
# f = open('log',mode='a+',encoding='utf-8')
# f.write('佳琪')
# count = f.tell()
# f.seek(count-9)
# print(f.read(2))
# f.close()
# with open('log',mode='r+',encoding='utf-8') as f,\
# open('log',mode='w+',encoding='utf-8') as f1:
2，编码。
#str --->byte encode 编码
# s = '二哥'
# b = s.encode('utf-8')
# print(b) #b'\xe4\xba\x8c\xe5\x93\xa5'
# #byte --->str decode 解码
# s1 = b.decode('utf-8')
# print(s1 #二哥
# s = 'abf'
# b = s.encode('utf-8')
# print(b) #b'abf'
# #byte --->str decode 解码
# s1 = b.decode('gbk') #abf
# print(s1)3，注册登录。
username = input('请输入你要注册的用户名：')
password = input('请输入你要注册的密码：')
with open('list_of_info',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('请输入你的用户名：')
pwd = input('请输入你的密码：')
with open('list_of_info',mode='r+',encoding='utf-8') as f1:
for line in f1:
lis.append(line)
if usn == lis[0].strip() and pwd == lis[1].strip():
print('登录成功')
break
else:print('账号和密码错误')
i+=1