如何输出到stderr

>>> shutddown

Traceback (most recent call last):

  File "", line 1, in

    shutddown

NameError: name 'shutddown' is not defined

>>> import sys

>>> print 'closing...'

closing...

>>> print >> sys.stderr,'closing...'

closing...

>>> def test(x):

if x == 0: print >> sys.stderr,'Error--> x:can\'t is zero'

else:print x

>>> test('what\'s')

what's

>>> test(0)

Error--> x:can't is zero

>>>

>>> sys.stderr.write('sf')

sf

>>> print sys.stderr.write('sf')

sfNone