python实现分割文件及合并文件的方法

本文实例讲述了python实现分割文件及合并文件的方法。分享给大家供大家参考。具体如下:

分割文件split.py如下:

#!/usr/bin/python
##########################################################################
# split a file into a set of parts; join.py puts them back together;
# this is a customizable version of the standard unix split command-line
# utility; because it is written in python, it also works on windows and
# can be easily modified; because it exports a function, its logic can
# also be imported and reused in other applications;
##########################################################################
import sys, os
kilobytes = 1024
megabytes = kilobytes * 1000
chunksize = int(1.4 * megabytes) # default: roughly a floppy
def split(fromfile, todir, chunksize=chunksize):
if not os.path.exists(todir): # caller handles errors
os.mkdir(todir) # make dir, read/write parts
else:
for fname in os.listdir(todir): # delete any existing files
os.remove(os.path.join(todir, fname))
partnum = 0
input = open(fromfile, ‘rb’) # use binary mode on windows
while 1: # eof=empty string from read
chunk = input.read(chunksize) # get next part

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