[Python] Making a polygon with Python matplotlib

I tried to make a single polygon with the following code, but it made two?

import matplotlib.pyplot as plt

x = [4, 1, 2]
y = [1, 2, 1]
z = [0, 2, 1]

plt.fill(x, y, z)
plt.show()


This code displays two polygons in different colors, but I want one polygon with a single, unified color.

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