def __getattr__(self, key):
        if key in iter(self.keys()):
            return self[key]
        else:
            raise AttributeError(key)
Builds the Authorization header to be sent in the request.
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/client/client.py/Metadata.__getattr__--crossover with--dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/gauth.py/generate_auth_header