[Python] Add plots directly to a document using python package docx

I am plotting some data and I want to automatically generate a report. I can save the plot and then add it to my document. However, I prefer to do it directly, without saving step. Going through the python-docx documentation I doubt it is doable by this package. Is there another way?

My code looks like this right now

from docx import Document
from docx.shared import Inches
import matplotlib.pyplot as plt
import numpy as np

t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2*np.pi*t)
plt.plot(t, s)
plt.savefig('test.png')

document = Document()
document.add_heading('Report',0)
document.add_picture('test.png', width=Inches(1.25))

document.save('report.docx')

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