Context manager getattr fix.

gistfile1.txt

from __future__ import with_statement

class CM1(object):
    def __enter__(self):
        print '__enter__'
        return self
    def __exit__(self, *args):
        print '__exit__'

class CM2(object):
    def __init__(self, inner):
        object.__setattr__(self, '_inner', inner)
    def __setattr__(self, name, value):
        setattr(self._inner, name, value)
    def __getattr__(self, name):
        return getattr(self._inner, name)
    def __enter__(self):
        return self._inner.__enter__()
    def __exit__(self, *args):
        return self._inner.__exit__(*args)

cm1 = CM1()

with cm1:
    print 'CM1'

cm2 = CM2(cm1)

with cm2:
    print 'CM2'