from matplotlib import pyplot as plt

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

ax = plt.GridSpec(2, 2)
ax.update(wspace=0.5, hspace=0.5)

ax1 = plt.subplot(ax[0, :])
ax2 = plt.subplot(ax[1, 0])
ax3 = plt.subplot(ax[1, 1])

plt.show()