#!/usr/bin/env python3
src_fname = input('please input the source file name: ')
dst_fname = input('please input the destination file name: ')
src_fobj = open(src_fname, 'rb')
dst_fobj = open(dst_fname, 'wb')
while True:
data = src_fobj.read(4096)
if not data:
break
dst_fobj.write(data)
src_fobj.close()
dst_fobj.close()
print('copy finished!')