f =open("demofile.txt","r") f.seek(4) print(f.readline()) Run Example » Definition and Usage Theseek()method sets the current file position in a file stream. Theseek()method also returns the new postion. Syntax file.seek(offset) ...
How to Use seek() Method To change the file handle’s position use seek() method. As we discussed, the seek() method sets the file’s current position, and then we can read or write to the file from that position. Syntax: f.seek(offset, whence) How many points the pointer will mo...
Python has a set of methods available for the file object.MethodDescription close() Closes the file detach() Returns the separated raw stream from the buffer fileno() Returns a number that represents the stream, from the operating system's perspective flush() Flushes the internal buffer isatty(...
里面在urlsA.txt中写入:http://localhost:4243,然后开启两个命令行,第一个输入:python client.py urlsA.txt A http://localhost:4242 回车,是不是出来提示符了。输入fetch B.txt回车,看到提示Couldn't find the file B.txt。 然后在第二个命令行中输入python client.py urlsC.txt C http://localhost:424...
文件方法method 文件对象方法 操作 file.close() 关闭文件 file.fileno() 文件描述符 file.flush() 刷新文件的内部缓冲区 file.isatty() 判断file是否是一个类tty设备 file.next() 返回文件的下一行类似于file.readline() file.read() 从文件读取size个字节,当未给定或给定负值的时候,读取剩余的所有字节,饭后作...
myfile.tell()用来返回当前读取文件的指针位置 ell() method of _io.TextIOWrapper instance Return current stream position. strlist = readlines(size)读取整个文件到字符串列表 字符串列表: [‘abc’,’cde’,’abasd’] 每次调用readlines(size)函数,会返回大约200MB的数据,而且所返回的必然都是完整的行数据...
seek(offset [,from])方法改变当前文件的位置。Offset变量表示要移动的字节数。From变量指定开始移动字节的参考位置。如果from被设为0,这意味着将文件的开头作为移动字节的参考位置。如果设为1,则使用当前的位置作为参考位置。如果它被设为2,那么该文件的末尾将作...
file.read(1) if (self.current == 'class' or self.current == 'constructor' or self.current == 'function' or self.current == 'method' or self.current == 'field' or self.current == 'static' or self.current == 'var' or self.current == 'int' or self.current == 'char' or ...
Method Status Protocol GigabitEthernet1/1 192.168.121.181 YES NVRAM up up GigabitEthernet1/2 192.168.110.2 YES NVRAM up up GigabitEthernet2/1 10.254.254.1 YES NVRAM up up GigabitEthernet2/2 10.254.254.5 YES NVRAM up up 这里我们尝试用re.search()来匹配: >>> test = '''Router#show ip int...
文件的定位读写- f.seek() f = open(filename) 第一个参数 开始的偏移量,也就是代表需要移动偏移的字节数 第二个参数 0 从文件开始读取 1 从当前位置去读 2 从文件末尾开始读取 f.seek(2,0) cont = f.readline() 打印出来的结果是从filename第二个字节开始的 ...