Hijack STDERR and STDOUT stream - useful in tests

gistfile1.txt

import sys

class MyStream(object):
    S = property(lambda self: self._S)

    def __init__(self):
        self._S = ""

    def write(self, s):
        self._S += s

    def read(self):
        return self._S

ms = MyStream()
print >> sys.stderr, "WRITE TO STDERR"
old_stderr = sys.stderr
sys.stderr = ms

print >> sys.stderr, "WRITE TO STDERR -HJKD"

print ms.read()