用Python写出下面这句话的代码，按照表 9-8 里的数据作出每月消费的饼图。要求随机输入一个月份，结果返回当月的饼图。

好的，我可以帮你写这段代码。假设你已经有了每个月的消费数据，可以按照以下步骤生成饼图：

1. 导入需要的库

import matplotlib.pyplot as plt

2. 定义每个月的消费数据

jan = 1000
feb = 1500
mar = 800
apr = 1200
may = 900
jun = 1100
jul = 1300
aug = 1600
sep = 1000
oct = 1200
nov = 1400
dec = 1800

3. 将每个月的消费数据存储在一个列表中

expenses = [jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec]

4. 随机输入一个月份并获取对应的消费数据

import random

month = random.choice(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'])

if month == 'Jan':
    expense = jan
elif month == 'Feb':
    expense = feb
elif month == 'Mar':
    expense = mar
elif month == 'Apr':
    expense = apr
elif month == 'May':
    expense = may
elif month == 'Jun':
    expense = jun
elif month == 'Jul':
    expense = jul
elif month == 'Aug':
    expense = aug
elif month == 'Sep':
    expense = sep
elif month == 'Oct':
    expense = oct
elif month == 'Nov':
    expense = nov
else:
    expense = dec

5. 生成饼图并显示

labels = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
sizes = expenses
colors = ['#ff9999','#66b3ff','#99ff99','#ffcc99', '#ffb3e6','#c2c2f0','#ffb3b3','#c2d6d6', '#c2f0c2','#f0e6c2','#d6d6c2','#e6c2f0']

plt.pie(sizes, colors=colors, labels=labels, autopct='%1.1f%%', startangle=90)
plt.axis('equal')
plt.title('Expenses for ' + month)
plt.show()

这样，你就可以随机生成每个月的饼图了。注意，如果你没有每个月的消费数据，需要自己定义或者从其他地方获取。