python基础之文件操作

文件操作：

#打开文件
'''
f = open("db","r")#只读
f = open("db","w")#只写，先清空原文件
f = open("db","x")#如果文件存在报错，不存在创建并写内容
f = open("db","a")#追加

"+" 表示可以同时读写某个文件
r+， 读写【可读，可写】
w+，写读【可读，可写】
x+ ，写读【可读，可写】
a+， 写读【可读，可写】
r+b，
w+b，
x+b，
a+b， 
最常用的是r+
'''
# f = open("db","r",encoding="utf-8")#以什么编码格式保存
# print(data,type(data))
# f.close()

# f = open("db","rb")# rb 读到的是字节类型，
# data = f.read()
# print(data,type(data))

# f = open("db","ab")
# f.write(bytes("hello",encoding="utf-8"))#追加是以字节类型，写也要以字节类型进行写
# f.close()

# f = open("db","r+",encoding="utf-8")
# date = f.read(1)
# print(f.tell())#告诉当前指针位置，永远是字节
# f.seek(f.tell())#主动调文件指针位置，切位置以后会进行覆盖，永远是以字节的方式
# f.write(777)#当前指针以后向后覆盖
# f.close()

#操作文件
# f.read()#默认无参数，读取全部，如果打开模式有b，则读字节
# f.seek()#指针跳转到某个位置，按照字节
# f.tell()#告诉指针当前位置，按照字节
# f.write()#写，有bytes，写字节。
# f.flush()#强刷
#
# f = open("db","w")
# print(f.readable())#判断是否可读，返回True or False
# f.readline()#只读第一行，再写一遍读取下一行
# f = open("db","r+")
# f.seek(3)
# f.truncate()#截断，指针位置以后的内容清空
# f.close()
#for 循环文件对象
#一行一行的读
# for line in f:
#     print(line)
#　　if XX in line: #判断数据是否在读取的内容里面


#read() #无参数，读全部；有参数按字符
# f = open("db","r")
# r = f.read()
# print(r)
# f.close()


#文件关闭
# f.close()
# with open("db","r") as f:
#     pass#执行完自动关闭

  def close(self, *args, **kwargs): # real signature unknown
        pass#关闭

    def detach(self, *args, **kwargs): # real signature unknown
        pass

    def fileno(self, *args, **kwargs): # real signature unknown
        pass

    def flush(self, *args, **kwargs): # real signature unknown
        pass#强制刷新

    def isatty(self, *args, **kwargs): # real signature unknown
        pass

    def read(self, *args, **kwargs): # real signature unknown
        pass#读

    def readable(self, *args, **kwargs): # real signature unknown
        pass#判断是否可读

    def readline(self, *args, **kwargs): # real signature unknown
        pass#仅读一行

    def seek(self, *args, **kwargs): # real signature unknown
        pass#指针跳转某个位置，以字节

    def seekable(self, *args, **kwargs): # real signature unknown#判断指针是否可以进行跳转
        pass

    def tell(self, *args, **kwargs): # real signature unknown
        pass#告诉指针在哪个位置，以字节

    def truncate(self, *args, **kwargs): # real signature unknown
        pass#截断，截断当前指针以后的内容清空

    def writable(self, *args, **kwargs): # real signature unknown
        pass#判断是否可写

    def write(self, *args, **kwargs): # real signature unknown
        pass#写