python简单分割文件的方法

#!/usr/bin/env python
def split(filename, size):
  fp = open(filename, 'rb')
  i = 0
  n = 0
  temp = open(filename+'.part'+str(i),'wb')
  buf = fp.read(1024)
  while(True):
    temp.write(buf)
    buf = fp.read(1024)
    if(buf == ''):
      print filename+'.part'+str(i)+';'
      temp.close()
      fp.close()
      return
    n += 1
    if(n == size):
      n = 0
      print filename+'.part'+str(i)+';'
      i += 1
      temp.close()
      temp = open(filename+'.part'+str(i),'wb')
if __name__ == '__main__':
  name = raw_input('input filename:')
  split(name, 307200) #分割后每个文件300M