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matplotlib.pyplot.scatterで時系列にそって連続的に色を変えたい

二次関数を例に、データの順番にしたがって色を変えてみる

import matplotlib.pyplot as plt

x = [xi for xi in range(-10,11)]
y = [xi**2 for xi in x]

# 色を各点ごとに変えていくために、各点と一対一となるような整数値のリストを作成
colours = [i for i in range(len(x))]

plt.scatter(x, y, c = colours, cmap = 'gnuplot')
plt.show()

すると、以下の図が得られる。
Screenshot 2019-10-06 at 17.54.28.png

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