import matplotlib.pyplot as plt

plt.figure(1, figsize=(3,3))
ax = plt.subplot(111)

ax.annotate("Test",
            xy=(0.2, 0.2), xycoords='data',
            xytext=(0.8, 0.8), textcoords='data',
            size=20, va="center", ha="center",
            arrowprops=dict(arrowstyle="simple",
                            connectionstyle="arc3,rad=-0.2"), 
            )

plt.show()