【Finish】Python Day 8

'''
1、文件操作
    test.txt
    1、文件路径：
    2、编码方式：utf-8 gbk……
    3、操作方式：只读、只写、追加、读写、写读……
    以什么编码方式存储的文件，就以什么编码方式操作打开

    只读：r
    非文字类的文件/上传下载文件/图片等:rb
    读写：r+
    读写（字节方式）：r+b

'''

# f = open('test.txt',mode='r',encoding='utf-8')
# content = f.read()
# print(content,type(content))
# f.close()

# 对于w，没有此文件，则创建文件；对于存在此文件，会将原来文件数据清空，重新写入
# f = open('log.txt',mode='w',encoding='utf-8')
# content = f.write('写权限 哦')
# f.close()

# # 对于wb,open('log.txt',mode='wb')不加编码方式
# f = open('log.txt',mode='wb')
# content = f.write('写权限123321'.encode('utf-8'))
# f.close()

# 追加：在原有数据的前提加放在最后追加
# f = open('log.txt',mode='a',encoding='utf-8')
# content = f.write('我是追击的数据')
# f.close()

# f = open('log.txt',mode='ab')
# content = f.write('4我是追击的数据'.encode('utf-8'))
# f.close()

# 先读后写
# f = open('log.txt',mode='r+',encoding='utf-8')
# print(f.read()) # 读完了，光标定位最后
# f.write('da xiao')
# f.close()

# 先写后读
# f = open('log.txt',mode='r+',encoding='utf-8')
# f.write('da') # 写完之后，默认定位在写结束的地方
# print(f.read())
# f.close()

# 按照字节类型进行读取写全
# f = open('log.txt',mode='r+b')
# print(f.read()) # 读完了，光标定位最后
# f.write('da xiao'.encode('utf-8'))
# f.close()

# 也是读写权限
# f = open('log.txt',mode='w+',encoding='utf-8')
# f.write('呵呵哒')
# f.seek(0) # 将光标调整到0的位置
# print(f.read())
# f.close()

# 追加：在原有数据的前提加放在最后追加
# f = open('log.txt',mode='a+',encoding='utf-8')
# f.write('我是追击的数据') # 将光标定位到追加数据的最后面
# # f.seek(0) # 将光标定位到最前面
# print(f.read())
# f.close()

# 功能详解
# f = open('log.txt',mode='r+',encoding='utf-8')
# # content = f.read() #读出来的都是字符
# f.seek(6) # 按照字节定光标的位置
# print(f.tell()) # 输出光标的位置
# content = f.read()
# print(content)
# f.close()

# f = open('log.txt',mode='a+',encoding='utf-8')
# content = f.write('我是追加的数据')
# count = f.tell() # 输出光标的位置
# f.seek(count-9)# 将最后9个字节相关数据输出
# print(f.read())
# f.close()

# f = open('log.txt',mode='r+',encoding='utf-8')
# f.readable() #是否可读
# line = f.readline() # 一行一行的读取
# line = f.readlines() # 每一行当成列表中的元素，添加到list
# f.truncate(6) # 对原文件截取相应个数
# for i in f:
#     print(i)
# f.close()
# 知识点：读取文件不能全部一起读，建议一行一行或者一部分一部分读取，

# 自动关闭，无需填写close
# with open('log.txt',mode='r+',encoding='utf-8') as obj:
#     print(obj.read())
#
# # 可以填写多个文件打开，使用with方式
# with open('log.txt', mode='r+', encoding='utf-8') as obj,\
#     open('log.txt', mode='r+', encoding='utf-8') as obj2:

# 登录注册相关
# username = input('please input your username：')
# password = input('please input your password：')
# with open('list_of_info',mode='w',encoding='utf-8') as f:
#     f.write('{}\n{}'.format(username,password))
# print('Register success')
#
# count = 0
# lst = []
# while count<3:
#     username1 = input('please input your username：')
#     password1 = input('please input your password：')
#
#     with open('list_of_info',mode='r',encoding='utf-8') as f2:
#         for line in f2:
#             lst.append(line)
#     if username1 == lst[0].strip() and password1 == lst[1].strip():
#         print('Login success')
#         break
#     else:
#         print('username or password is wrong')
#     count+=1

# 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)