python seabornのヒートマップのカラーバーの大きさについて

Question

カラーバーの大きさをヒートマップの縦幅と同じにしたいのですが，方法がわかりません

import pandas as pd
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt

heat = [[1,1,0.997050976,0.997539013,0.993040369,0.974253976,0.942366882,0.905319796],[1,0.5,0.999971986,0.999927235,0.997181063,0.993258331,0.983775894,0.971285339],[1,0.9,0.99991054,0.999782198,0.999391379,0.997797481,0.994833392,0.992249091],[1]]
df = pd.DataFrame(data=heat, columns=['1','2','3','4', '5', '6','7','8'], index=['1','2','3','4'])
fig, ax = plt.subplots(figsize=(8,8))
sns.heatmap(df,cmap='Blues',annot=True,square = True,fmt="1.5f",vmax=1.0,cbar = True)
ax.set_xlabel('x')
ax.set_ylabel('y')
plt.show()

Answer 1

figsizeの縦横比率で調整するのはダメですか？

figsize=(8, 3)