shutil_copyobj.py

#!/usr/bin/env python
#
# it appears os or sys are not
# needed. hmmm

from shutil import *
#import os
from StringIO import StringIO
#import sys


class VerboseStringIO(StringIO):
    def read(self, n=-1):
        next = StringIO.read(self, n)
        print 'read(%d) bytes' % n
        return next

lorem_ipsum = '''Lorem ipsum dolor sit amet, consectetuer
adipiscing elit. Vestibulum aliquam mollis dolor. Donec
vulputate nunc ut diam.
Ut rutrum mi vel sem. Vestibulum ante ipsum.'''

print 'Default:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output)

print

print 'All at once:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output, -1)

print

print 'Blocks of 256:'
input = VerboseStringIO(lorem_ipsum)
output = StringIO()
copyfileobj(input, output, 256)