how to save a pylab figure into in-memory file which can be read into PIL image?

by

Remember to call buf.seek(0) so Image.open(buf) starts reading from the
beginning of the buf:

import io
from PIL import Image
import matplotlib.pyplot as plt

plt.figure()
plt.plot([1, 2])
plt.title("test")
buf = io.BytesIO()
plt.savefig(buf, format="png")
buf.seek(0)
im = Image.open(buf)
im.show()
buf.close()

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