How to export matplotlib file to kml

I'm trying to export a matplotlib figure using a kml format. The question is identical to the following:

https://stackoverflow.com/questions/31709437/export-python-plot-to-kml

I've outlined the exact function but I can't get the kml output to work. Conversely, if I export a simplekml function, it's working fine.

I've attached both outputs below. Output 1 one works but 2 doesn't.

Output 1:

import simplekml
kml = simplekml.Kml()
kml.newpoint(name="Kirstenbosch", coords=[(18.432314,33.988862)])
kml.save("botanicalgarden.kml")

But when trying to pass a matplotlib function to simplekml function, I'm returning the following output. What am I doing wrong?

Output 2:

import matplotlib
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as ppl
from pylab import rcParams
import simplekml
rcParams['figure.figsize'] = (8,8)

# create rectangle over 0 to 10 degrees longitude and 0 to 10 degrees latitude
x = [0, 10, 10, 0, 0]
y = [10, 10, 0, 0, 10]
x1 = range(0,11)    # to draw a diagonal line

fig = ppl.figure(1)
ax = fig.add_axes([0,0,1,1])
ax.axis('off')
fig.patch.set_facecolor('blue')  # so we can see the true extent

ppl.plot(x, y, 'r', linewidth=3)
ppl.plot(x, y, '.b', linewidth=3)
ppl.plot(x1, x1, 'g', linewidth=3)

ppl.axis('off')
border1 = ppl.axis()

if False:
    ppl.show()
else:
    pngName = 'Overlay.png'
    fig.savefig(pngName, facecolor=fig.get_facecolor(), transparent=False)

bottomleft  = (border1[0],border1[2])
bottomright = (border1[1],border1[2])
topright    = (border1[1],border1[3])
topleft     = (border1[0],border1[3])

kml = simplekml.Kml()
ground = kml.newgroundoverlay(name='GroundOverlay')
ground.icon.href = pngName
ground.gxlatlonquad.coords =[bottomleft, bottomright, topright, topleft]
kml.save("GroundOverlay.kml")

Ensure you have done the following:

pip install matplotlib
pip install basemap
pip install simplekml

Versions I have installed:

Matplotlib version: 3.7.1
Basemap version: 1.3.7  
Simplekml version: 1.3.2

How to find the versions you have installed from command line:

python -c "import matplotlib; import mpl_toolkits.basemap; import simplekml; print('Matplotlib version:', matplotlib.__version__); print('Basemap version:', mpl_toolkits.basemap.__version__); print('Simplekml version:', simplekml.__version__)"

Moreover, Check that you are in the correct working directory. Additionally, ensure you have the necessary permissions in the target directory. If the program does not have write permissions, it will not be able to save the KML file. Furthermore, check for compatibility issues: It's possible that there may be compatibility issues between the versions of mpl_toolkits.basemap and matplotlib you are using.

Lastly, I was able to run your code just fine. See image below:

The code that you provided: