(self)
Return the size of the leading dimension of self.

        Returns:
            int: the size of the leading dimension.

        Raises:
            NotImplementedError: Can't be instantiated directly.
Return the size of the leading dimension of self.
Return the size of the leading dimension of self .
def __len__(self):
        """
        Return the size of the leading dimension of self.

        Returns:
            int: the size of the leading dimension.

        Raises:
            NotImplementedError: Can't be instantiated directly.
        """
        raise NotImplementedError()
def __len__ ( self ) : raise NotImplementedError ( )