day 08 文件操作

1.文件操作

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
  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，就必须以什么编码方式打开

  只读：#bytes——>str
    # f=open('gcs',mode = 'r',encoding = 'utf-8')
    # content = f.read()
    # print(content)
    # f.close()
    #rb 是bytes(非文字文件)
    f=open('gcs',mode = 'rb')
    content = f.read()
    print(content,type(content))
    f.close()

    #只写：
    #对于写，没有此文件就会创建文件
    # f=open('log',mode = 'w',encoding = 'utf-8')
    # f.write('秀秀秀秀')
    # 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('秀顺')
    # f.close()
    #wb bytes
    # f=open('log',mode = 'wb')
    # f.write('秀顺'.encode('utf-8'))
    # f.close()

    #追加：
    # f=open('log',mode = 'a',encoding='utf-8')
    # f.write('在一起')
    # f.close()

    f=open('log',mode = 'ab')
    f.write('可以吗'.encode('utf-8'))
    f.close()

    #读写，先读出内容，在写入
    # f= open('log',mode='r+',encoding='utf-8')
    # print(f.read())
    # f.write('祝您们幸福')
    # f.close()

    #读写的 bytes
    f= open('log',mode='r+b')
    print(f.read())
    f.write(''.encode('utf-8'))
    f.close()

 #功能详解

 f=open('gcs',mode = 'r+',encoding = 'utf-8')
 # content = f.read(3)#读出来的都是字符
 # f.seek(3)#按字节定光标的位置
 #f.tell() #告诉你光标位置
 # f.readable()#可读的
 # 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，添加到列表list

 # f.truncate(3)#在源文件截取
 # print(line)
 # for line in f:
 #     print(line)
 # f.close()
 # count=f.tell()
 # f.seek(count-9)
 # content = f.read(2)
 # print(content)
 # f.close()

 # with open('gcs',mode = 'r+',encoding = 'utf-8') as obj:
 #     # obj.read()
 #     print(obj.read())

 with open('gcs', mode='r+', encoding='utf-8') as obj,\
         open('log', mode='r+', encoding='utf-8') as f1:
         # obj.read()
     print(obj.read())
     print(f1.read())

2.编码

  #str --->byte  encode 编码
 # s = '二哥'
 # b = s.encode('utf-8')
 # print(b)
 # #byte --->str decode 解码
 # s1 = b.decode('utf-8')
 # print(s1)

 # s = 'abf'
 # b = s.encode('utf-8')
 # print(b)
 # #byte --->str decode 解码
 # s1 = b.decode('gbk')
 # print(s1)

3.注册登录

 username = input('请输入账户名：')
 passward = input('请输入密码：')
 with open('f1', mode='w', encoding='utf-8') as obj:
     obj.write('{}\n{}'.format(username,passward))
 print('恭喜您，注册成功！')
 lis = []
 i = 0
 while i < 3:
     usn = input("请输入用户名：")
     pwd = input('请输入密码：')
     with open('f1', mode='r+', encoding='utf-8') as obj:
         for line in obj:
             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