Matplotlib运行并引发错误（MatplotlibDeprecationWarning）

Question

我正在运行一个饼图，该图可以工作，但是会引发错误。即时通讯到matplotlib，所以我该如何解决

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
df = pd.DataFrame(3 * np.random.rand(4, 2), index=['a', 'b', 'c', 'd'])
df.plot.pie(subplots=True, figsize=(15, 8))
plt.show()

，错误是：

MatplotlibDeprecationWarning: 
The colNum attribute was deprecated in Matplotlib 3.2 and will be removed two minor releases later. Use ax.get_subplotspec().colspan.start instead.
  if not layout[ax.rowNum + 1, ax.colNum]: