Matplotlib.pyplot.axhspan() in Python

#Implementation of matplotlib function import numpy as np import matplotlib.pyplot as plt t = np.arange(-2, 3, .01) s = np.sin(np.pi * t) plt.plot(t, s, color ='black') plt.axhline(y = 1, color ='black') plt.axvline(x = 1, color ='black') plt.axvline(x = 0.5, ymin = 0.75, linewidth = 8, color ='green') plt.axhline(y =.5, xmin = 0.25, xmax = 0.75, color ='black') plt.axhspan(0.25, 0.75, facecolor ='0.5', alpha = 0.5) plt.axvspan(2.25, 2.55, facecolor ='green', alpha = 0.5) plt.title('matplotlib.pyplot.axhspan() Example\n', fontsize=14, fontweight='bold') plt.show()