Marker filling options Matplotlib

Question

I need more marker-filling options. I came up with this trick to make a more interesting marker without using colours.

fig, ax = plt.subplots()
a = np.random.random(5)
b = np.random.random(5)
[ax.scatter(a, b, s=eses, edgecolor='k', lw=.5, color='None', label = 'This is not what I want') for eses in [200, 100, 30, 1]]
ax.set_title('Marker options')
ax.legend()
plt.show()

I have two questions:

1. how to fix the legend so that the same concentric rings show up as one symbol in the legend instead of four symbols of different sizes.

2. how to get a dashed circle for a marker (circle with parallel - diagonal lines inside of it), or a circle filled with dots.

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EDIT: Thanks to the users who commented. I've seen both websites suggested before posting my question; however, I am not looking for custom marker shapes. I am looking for custom fillings for a simple circle marker.

Answer 1

I found what I was looking for, it was the hatch option:

plt.title('Marker options')
plt.scatter(range(3), range(3), s=150, edgecolor='k', c='w', hatch='ooo', label='option 1')
plt.scatter(np.linspace(.2,4,3), np.linspace(0,3,3), s=200, edgecolor='k', c='w', hatch='+++', label='option 2')
plt.scatter(np.linspace(0,5,3), np.linspace(4,0,3), s=200, edgecolor='k', c='w', hatch='***', label='option 3')
plt.scatter(np.linspace(0,3,3), np.linspace(4,1,3), s=200, edgecolor='k', c='w', hatch='/////', label='option 4')
plt.legend()
plt.show()