在Python中从大文件删除行的最快方法

对于同一文件，您可以同时具有两个文件对象（一个用于读取，一个用于写入）：

def removeLine(filename, lineno):    fro = open(filename, "rb")    current_line = 0    while current_line < lineno:        fro.readline()        current_line += 1    seekpoint = fro.tell()    frw = open(filename, "r+b")    frw.seek(seekpoint, 0)    # read the line we want to discard    fro.readline()    # now move the rest of the lines in the file     # one line back     chars = fro.readline()    while chars:        frw.writelines(chars)        chars = fro.readline()    fro.close()    frw.truncate()    frw.close()