python3画直方图出现“Polygon‘ object has no property ‘normed”

直方图原程序

import numpy as np
import matplotlib.pyplot as plt

np.random.seed(0)
mu,sigma = 100, 20 #均值和标准差
a = np.random.normal(mu, sigma, size=100)

plt.hist(a, 20, normed=1, histtype='stepfilled', facecolor='b', alpha=0.75)
plt.title('Histogram')

plt.show()

运行时显示，‘Polygon’ object has no property ‘normed’

经查找，normed=1的属性已经取消，可以使用density=True。

运行无问题。

正确代码

import numpy as np
import matplotlib.pyplot as plt

np.random.seed(0)
mu,sigma = 100, 20 #均值和标准差
a = np.random.normal(mu, sigma, size=100)

plt.hist(a, 20, density=True, histtype='stepfilled', facecolor='b', alpha=0.75)
plt.title('Histogram')

plt.show()

结果