2.10 读取打快数据文件

import sys

#filename = sys.argv[1]
filename=raw_input()
with open(filename,‘rb‘) as hugefile:
    chunksize =1000
    readable=‘‘

    while hugefile:
        start = hugefile.tell()
        print "starting at:", start
        file_block = ‘‘
        for _ in xrange(start, start+chunksize):
            line = hugefile.next()
            file_block = file_block + line
            print ‘file_block‘, type(file_block), file_block
        readable = readable + file_block
        stop = hugefile.tell()
        print ‘readable‘ ,type(readable), readable
        print ‘ reading bytes from %s to %s‘ % (start, stop)
        print ‘ read bytes total:‘,len(readable)