python - Setting of size of the figure

Question

How to set the desired size of a figure, please?

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
plt.rcParams["figure.figsize"] = [10, 10]

x = [1, 2, 3]
y = x
plt.plot(x, y, zorder = -1, c = 'grey')


plt.savefig('b.pdf') 

Answer 1

等待大神答复