[python] all markers in matplotlib.pypolot.scatter

import matplotlib.pyplot as plt
import numpy as np
import matplotlib

markers = {'.': 'point', ',': 'pixel', 'o': 'circle', 'v': 'triangle_down', '^': 'triangle_up', '<': 'triangle_left', '>': 'triangle_right', 
                    '1': 'tri_down', '2': 'tri_up', '3': 'tri_left', '4': 'tri_right', '8': 'octagon', 's': 'square', 'p': 'pentagon', '*': 'star', 
                    'h': 'hexagon1', 'H': 'hexagon2', '+': 'plus', 'x': 'x', 'D': 'diamond', 'd': 'thin_diamond', '|': 'vline', '_': 'hline', 
                    'P': 'plus_filled', 'X': 'x_filled', 0: 'tickleft', 1: 'tickright', 2: 'tickup', 3: 'tickdown', 4: 'caretleft', 5: 'caretright', 
                    6: 'caretup', 7: 'caretdown', 8: 'caretleftbase', 9: 'caretrightbase', 10: 'caretupbase', 11: 'caretdownbase', 
                    'None': 'nothing', None: 'nothing', ' ': 'nothing', '': 'nothing'}

N = 50
x = np.random.rand(N)
y = np.random.rand(N)
area = (30 * np.random.rand(N))**2 

for key, value in markers.items():
    plt.scatter(x, y, s=area, c="g", alpha=0.5, marker=key, label=value)
    plt.legend(loc=1)
    plt.show()