How to save matplotlib chart to temporary file in python?

I need to save a Matplot plot to a temporary file that I control since this code would be in a python Flask REST service.

I tried this:

fp = tempfile.NamedTemporaryFile() return_base64 = ""

with fp:
    fp.write(plt.savefig) # THIS IS WRONG....
    with open(fp.name, 'rb') as open_it:
        open_it.seek(0)
        return_base64 = str(base64.b64encode(open_it.read()))
        # strip off leading b and ' and trailing '
        return_base64 = return_base64[2: len(return_base64) - 1]
        open_it.close()
    fp.close()

But, "fp.write" doesn't work with saving the plt.savefig as I did above.

My issue is that I'm using the PRAAT phonetic library and there does not seem to be a way to use the "Sound()" method inside a REST service. Thus, I'm doing lots of temporary files to work around this.

So, how do I write the matplotib plot to a named temporary file?

Appreciation and thanks in advance.

i am sharing this code it is storing jpg file in my temporary folder

import io 

buf = io.BytesIO()
plt.savefig(buf, format="jpg")
#print(buf.getvalue()) return bytes of plot 

fp = tempfile.NamedTemporaryFile() 

# print(fp.name) return file name 

with open(f"{fp.name}.jpg",'wb') as ff:
    ff.write(buf.getvalue()) 

buf.close()