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# Scatter plots with a legend

Also demonstrates how transparency of the markers can be adjusted by giving `alpha` a value between 0 and 1.

    import matplotlib.pyplot as plt
    from numpy.random import rand

    fig, ax = plt.subplots()
    for color in ['red', 'green', 'blue']:
        n = 750
        x, y = rand(2, n)
        scale = 200.0 * rand(n)
        ax.scatter(x, y, c=color, s=scale, label=color,
                   alpha=0.3, edgecolors='none')

    ax.legend()
    ax.grid(True)

    plt.show()

Total running time of the script: ( 0 minutes 0.050 seconds)

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