import numpy as np
import matplotlib.pyplot as plt

fig, axs = plt.subplots(2, 1)

for i in range(2):
    axs[i].annotate(f'axs[{i}]', (0.5, 0.5),
                    ha='center', va='center', fontsize=18,
                    color='darkgrey')
fig.suptitle('plt.subplots()')

plt.show()