In [956]: plt.scatter(0,0,marker='*')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)

/home/pi/tmp/local/lib/python2.5/site-packages/matplotlib/pyplot.pyc in scatter(x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, faceted, verts, hold, **kwargs)
   2374     if hold is not None:
   2375         ax.hold(hold)
-> 2376     try:
   2377         ret = ax.quiver(*args, **kw)
   2378         draw_if_interactive()

/home/pi/tmp/local/lib/python2.5/site-packages/matplotlib/axes.pyc in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, faceted, verts, **kwargs)
   5742 
   5743         self._process_unit_info(xdata=x, ydata=y, kwargs=kwargs)
-> 5744         x = self.convert_xunits(x)
   5745         y = self.convert_yunits(y)
   5746 

ValueError: Unknown marker symbol to scatter

In [957]: plt.clf()

In [958]: plt.plot(0,0,'*')
Out[958]: [<matplotlib.lines.Line2D object at 0x7f3467c18d10>]