@classmethod
    def use(cls, server_url, timestamp, salt):
        raise NotImplementedError('Implement in subclass')
Given a gui string return the gui and mpl backend.
dataset/ETHPy150Open omab/python-social-auth/social/storage/base.py/NonceMixin.use--crossover with--dataset/ETHPy150Open ipython/ipython-py3k/IPython/lib/pylabtools.py/find_gui_and_backend