问生成一个范畴变量列表，其中分类计数是正态分布的。

EN

import numpy as np 
import matplotlib.pyplot as plt

credit_score_types = {
    'Aaa':0,
    'Aa1':1,
    'Aa2':2,
    'Aa3':3,
    'A1':4,
    'A2':5,
    'A3':6,
    'Baa1':7,
    'Baa2':8,
    'Baa3':9,
    'Ba1':10,
    'Ba2':11,
    'Ba3':12,
    'B1':13,
    'B2':14,
    'B3':15,
    'Caa':16,
    'Ca':17,
    'C':18,
    'e, p':19,
    'WR':20,
    'unsolicited':21,
    'NR':22
}

# generate normally distributed data, fix random state 
np.random.seed(42)
mu, sigma = credit_score_types['Ba2'], 5
X = np.random.normal(mu, sigma, 1000)

fig, ax = plt.subplots()

counts, bins = np.histogram(X, bins = np.linspace(-0.5, 22.5, 23))

# create a new dictionary of category names and counts
data = dict(zip(credit_score_types.keys(), counts))
ax.bar(data.keys(), data.values())
plt.xticks(rotation = 'vertical')

plt.show()