gistfile1.py

{11:47} kb1pkl@sherman[~]$ python
Python 2.7.3 (default, Jun 15 2012, 18:14:05) 
[GCC 4.7.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...     def write(self, msg):
...             pass
... 
>>> sys.stdout = Foo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'sys' is not defined
>>> import sys
>>> sys.stdout = Foo()
>>> sys.stdout.write('hello')
>>> import subprocess
>>> subprocess.call(['echo', 'hello'], stdout=subprocess.PIPE)