Multiple datasets on the same scatter plot

You need a reference to an Axes object to keep drawing on the same subplot.

import matplotlib.pyplot as plt

x = range(100)
y = range(100,200)
fig = plt.figure()
ax1 = fig.add_subplot(111)

ax1.scatter(x[:4], y[:4], s=10, c="b", marker="s", label="first")
ax1.scatter(x[40:],y[40:], s=10, c="r", marker="o", label="second")
plt.legend(loc="upper left")
plt.show()

enter image description here

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