from io import BytesIO
import pickle
from matplotlib import pyplot

fig = pyplot.plot(.....)

sio = BytesIO()
pickle.dump(obj, sio, -1)
sio.seek(0)
binary_to_save = sio.read()

with open(figure_path, 'wb') as file:
    file.write(binary_to_save)

with open(figure_path, 'rb') as file:
    raw = file.read()

figure = pickle.load(BytesIO(raw))