Adding charts to a matplotlib subgrid

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I have the following Matplotlib figure, with 2 charts:

That i created with the following code:

fig = plt.figure(facecolor='#131722',dpi=155, figsize=(8, 4))
ax1 = plt.subplot2grid((1,2), (0,0), facecolor='#131722')
ax2 = plt.subplot2grid((1,2), (0,1), facecolor='#131722')

Now i would like to add two charts, so ax3 and ax4, each needs to be below the two charts, they should have the same width of the two charts but half the height of the two bigger charts. How can i do that? I tried various solutions from here here but i'm struggling to get the expected output

matplotlib python-3.x python
1 Answers

You can achieve this using the gridspec_kw argument of plt.subplots. This allows you to specify the dimensions of the grid (in this case 2x2) and the ratio of the heights:

f, ax = plt.subplots(2, 2 , gridspec_kw={"height_ratios": [2, 1]})
for cAx in ax.flatten():
    cAx.set_facecolor('#131722')
f.savefig("test.png", facecolor='#131722')

enter image description here

Alternatively, you can also create a 3x2 grid and specify that the first two subplots need to span two rows:

fig = plt.figure(facecolor='#131722',dpi=155, figsize=(8, 6))
ax1 = plt.subplot2grid((3,2), (0,0), facecolor='#131722', rowspan=2)
ax2 = plt.subplot2grid((3,2), (0,1), facecolor='#131722', rowspan=2)
ax3 = plt.subplot2grid((3,2), (2,0), facecolor='#131722')
ax4 = plt.subplot2grid((3,2), (2,1), facecolor='#131722')
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