import matplotlib.pyplot as plt

plt.text(0.6, 0.5, "test", size=50, rotation=30.,
         ha="center", va="center", 
         bbox = dict(boxstyle="round",
                     ec=(1., 0.5, 0.5),
                     fc=(1., 0.8, 0.8),
                     )
         )

plt.text(0.5, 0.4, "test", size=50, rotation=-30.,
         ha="right", va="top", 
         bbox = dict(boxstyle="square",
                     ec=(1., 0.5, 0.5),
                     fc=(1., 0.8, 0.8),
                     )
         )

    
plt.draw()
plt.show()