Combine two matplotlib markers into one in legend

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To have a custom marker, I made two scatter plots with same data points but different markers. Thus by plotting one marker on top of the other I get the look of a new custom marker. Now I want to use it in legend. Is there a way I can use two markers one on top of the other in legend and show them as a single marker.

Edit: The question is not regarding how to share the same label for two different markers, but how to plot one marker on top of other in the legend

legend matplotlib plot python
1 Answers

Using a tuple of markers answers the question;


    from numpy.random import randn
    m=np.random.uniform(size=10)
    x=np.arange(0,10,1)
    y=x**2
    fig, ax = plt.subplots(1,1)
    
    blue_dot = ax.scatter(x[:5],y[:5], s=m*100, color='b')

    red_dot = ax.scatter(x[5:],y[5:], s=200*m, color='r')
    black_cross = ax.scatter(x[5:],y[5:], s=400*m, marker='+', color='k')
    
    lgnd = ax.legend([blue_dot, (red_dot, black_cross)], ["Blue Circle", "Red Circle and Black Cross"])

enter image description here

Now I want to change the size of the markers in the legend so that all the markers of equal size. For that, I have tried adding this to above code.

lgnd.legendHandles[0]._sizes = [200]
lgnd.legendHandles[1]._sizes = [200] # this is affecting the size of red_dot only

enter image description here

How do I change the size of black_cross as well in the legend?

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