import matplotlib as mpl
from matplotlib import pyplot as plt, gridspec, testing

mpl.rcdefaults()
mpl.style.use(["classic", "_classic_test_patch"])
mpl.testing.set_font_settings_for_testing()

def example_plot(ax, fontsize=12):
    ax.plot([1, 2])
    ax.locator_params(nbins=3)
    ax.set_xlabel('x-label', fontsize=fontsize)
    ax.set_ylabel('y-label', fontsize=fontsize)
    ax.set_title('Title', fontsize=fontsize)

fig = plt.figure(constrained_layout=True)
gs = gridspec.GridSpec(3, 3, figure=fig)

ax1 = fig.add_subplot(gs[0, 0])
ax2 = fig.add_subplot(gs[0, 1:])
ax3 = fig.add_subplot(gs[1:, 0:2])
ax4 = fig.add_subplot(gs[1:, -1])

for ax in fig.axes:
    example_plot(ax)

fig.savefig("/tmp/cl1.png")

fig = plt.figure(constrained_layout=True)
gs = gridspec.GridSpec(3, 3, figure=fig,
                       width_ratios=[1, 1, 1], height_ratios=[1, 1, 1])

ax1 = fig.add_subplot(gs[0, 0])
ax2 = fig.add_subplot(gs[0, 1:])
ax3 = fig.add_subplot(gs[1:, 0:2])
ax4 = fig.add_subplot(gs[1:, -1])

for ax in fig.axes:
    example_plot(ax)

fig.savefig("/tmp/cl2.png")

plt.show()