if (c_none or                co is not None or                isinstance(c, str) or                (isinstance(c, collections.Iterable) and                     len(c) > 0 and # proposed fix here                    isinstance(c[0], str))):

importpandasaspdimportseabornassnsdf=pd.DataFrame(dict(category=['a','a','b','b','c'],hue=['x','y','x','y','x'],values=[1,2,3,4,3]))sns.swarmplot('category','values',hue='hue',data=df,dodge=True)

IndexError                                Traceback (most recent call last)<ipython-input-5-0368a082f6a8> in <module>----> 1 sns.swarmplot('category', 'values', hue='hue', data=df, dodge=True)h:\anaconda3\lib\site-packages\seaborn\categorical.py in swarmplot(x, y, hue, data, order, hue_order, dodge, orient, color, palette, size, edgecolor, linewidth, ax, **kwargs)   2989                        linewidth=linewidth))   2990 -> 2991     plotter.plot(ax, kwargs)   2992     return ax   2993 h:\anaconda3\lib\site-packages\seaborn\categorical.py in plot(self, ax, kws)   1444     def plot(self, ax, kws):   1445         """Make the full plot."""-> 1446         self.draw_swarmplot(ax, kws)   1447         self.add_legend_data(ax)   1448         self.annotate_axes(ax)h:\anaconda3\lib\site-packages\seaborn\categorical.py in draw_swarmplot(self, ax, kws)   1429                     kws.update(c=point_colors)   1430                     if self.orient == "v":-> 1431                         points = ax.scatter(cat_pos, swarm_data, s=s, **kws)   1432                     else:   1433                         points = ax.scatter(swarm_data, cat_pos, s=s, **kws)h:\anaconda3\lib\site-packages\matplotlib\__init__.py in inner(ax, data, *args, **kwargs)   1803                         "the Matplotlib list!)" % (label_namer, func.__name__),   1804                         RuntimeWarning, stacklevel=2)-> 1805             return func(ax, *args, **kwargs)   1806    1807         inner.__doc__ = _add_data_doc(inner.__doc__,h:\anaconda3\lib\site-packages\matplotlib\axes\_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, **kwargs)   4194                 (isinstance(c, collections.Iterable) and   4195                     # len(c) > 0 and-> 4196                     isinstance(c[0], str))):   4197             c_array = None   4198         else:IndexError: index 0 is out of bounds for axis 0 with size 0