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# -*- coding: utf-8 -*-
import pandas as pd
import matplotlib.pyplot as plt 
 
# 导入数据，并进行初步观察
lianjia_df = pd.read_csv('lianjia.csv')
#删除id
lianjia_df.drop('Id',axis=1,inplace=True)
#print(lianjia_df.head(10))
#增加新的列
lianjia_df['UnitPrice']=round(lianjia_df['Price']/lianjia_df.Size,2)
mean_price=lianjia_df.groupby('Region',sort=False)['UnitPrice'].mean()#每个城区单价
print(mean_price)
plt.rcParams['font.sans-serif']=['SimHei']
y=mean_price
x=lianjia_df.Region.unique()
plt.figure(figsize=(25,12))
plt.bar(x,y)