import matplotlib.pyplot as plt
import matplotlib.patches as patches

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

x = y = 0.1
fig = plt.figure()
ax = fig.add_subplot(111)

patch = ax.add_patch(patches.Rectangle((x, y), 0.5, 0.5, alpha=0.5, facecolor='red', label='Rectangle'))

plt.legend(loc='upper right')

plt.show()