matrixcache.py 文件源码

def get_matrix(self, name, format):
        """Get a cached matrix by name and format.

        Parameters
        ----------
        name : str
            A descriptive name for the matrix, like "identity2".
        format : str
            The format desired ('sympy', 'numpy', 'scipy.sparse')
        """
        m = self._cache.get((name, format))
        if m is not None:
            return m
        raise NotImplementedError(
            'Matrix with name %s and format %s is not available.' %
            (name, format)
        )