def __call__(self, *agrs, **kwargs):
        raise NotImplementedError()

    # a set of conversion routines to be used by derived classes
Return True if this RowProxy contains the given key.
dataset/ETHPy150Open yhat/ggplot/ggplot/utils/color.py/ColorModel.__call__--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/engine/result.py/RowProxy.has_key