How to save Matplotlib plot to string as SVG

You can use StringIO to save a Matplotlib plot to a string without saving it to an intermediary file:

from matplotlib import pyplot as plt
plt.plot([0, 1], [2, 3]) # Just a minimal showcase

# Save plot to StringIO
from io import StringIO
i = StringIO()
plt.savefig(i, format="svg")

# How to access the string

Note that unless you save to a file you need to set the format=... parameter when calling plt.savefig(). If saving to a file, Matplotlib will try to derive the format from the filename extension (like .svg)