matplotlib/matplotlib · error · RuntimeError

{name} must be a sequence

Error message

{name} must be a sequence

What it means

Error "{name} must be a sequence" thrown in matplotlib/matplotlib.

Source

Thrown at lib/mpl_toolkits/mplot3d/art3d.py:340

        Parameters
        ----------
        x : array-like
            The x-data to be plotted.
        y : array-like
            The y-data to be plotted.
        z : array-like
            The z-data to be plotted.

        Notes
        -----
        Accepts x, y, z arguments or a single array-like (x, y, z)
        """
        if len(args) == 1:
            args = args[0]
        for name, xyz in zip('xyz', args):
            if not np.iterable(xyz):
                raise RuntimeError(f'{name} must be a sequence')
        self._verts3d = args
        self.stale = True

    def get_data_3d(self):
        """
        Get the current data

        Returns
        -------
        verts3d : length-3 tuple or array-like
            The current data as a tuple or array-like.
        """
        return self._verts3d

    @artist.allow_rasterization
    def draw(self, renderer):
        scale_mask = _scale_invalid_mask(*self._verts3d, self.axes)
        if self._axlim_clip:

View on GitHub (pinned to b379c1b69e)

When it happens

Trigger: Thrown at lib/mpl_toolkits/mplot3d/art3d.py:340 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of matplotlib/matplotlib@b379c1b69e (2026-08-21). Data as JSON: /api/errors/e26eae7801140d00. Report an issue: GitHub.