this does not work for subprocess stdout too

[braindevices]

with tee.StdoutTee('/tmp/testtee.log'):
    subprocess.call('ls .', stdout=sys.stdout, shell=True)
``
raises: 

c2pwrite = stdout.fileno()

AttributeError: 'StdoutTee' object has no attribute 'fileno'

I think better way to do this maybe just subclass the file object.