learning python fifth edition

preservation.f.closed# If the file is closed, returns truef.encoding# viewing the encoding format of open files using the, note that not the actual encoding format of the fileF.tell #查看文件处理当前的光标位置F.seek (3) #从头开始运算, move the cursor to the third byteF.truncate #从头开始运算, files are kept only from 0-10 bytes of content, and the file must be opened in writing, except for ' W ' and ' w+ '.6 advanced application of the Seek methodSeek a total of 2 parameters, the first parameter is the number of cursor

follows:1nums=[1,2,3,4,5,6,2,3,4,6,4,3,2,1,2,3,4]2 Print(Nums[3:6])#[4,5,6]3 Print(Nums[:6])#[1,2,3,4,5,6] If the previous value of the slice is not written, the number from the beginning4 Print(nums[3:])#[4,5,6,2,3,4,6,4,3,2,1,2,3,4] If the subsequent value of the slice is not written, take the end5 Print(nums[:])#if the two values of a slice are not written, take it from the beginning to the end6 Print(Nums[::2])#step is 2, this represents all the elements, and then every 2 elements take a7 P