我正试图在 pandas 中复制 SQL 的窗口函数。
SELECT avg(totalprice) OVER (
PARTITION BY custkey
ORDER BY orderdate
RANGE BETWEEN interval '1' month PRECEDING AND CURRENT ROW)
FROM orders
我有这个数据框:
from io import StringIO
import pandas as pd
myst="""cust_1,2020-10-10,100
cust_2,2020-10-10,15
cust_1,2020-10-15,200
cust_1,2020-10-16,240
cust_2,2020-12-20,25
cust_1,2020-12-25,140
cust_2,2021-01-01,5
"""
u_cols=['customer_id', 'date', 'price']
myf = StringIO(myst)
import pandas as pd
df = pd.read_csv(StringIO(myst), sep=',', names = u_cols)
df=df.sort_values(list(df.columns))
在计算仅限于最近1个月的移动平均值之后,它将如下所示...
from io import StringIO
import pandas as pd
myst="""cust_1,2020-10-10,100,100
cust_2,2020-10-10,15,15
cust_1,2020-10-15,200,150
cust_1,2020-10-16,240,180
cust_2,2020-12-20,25,25
cust_1,2020-12-25,140,140
cust_2,2021-01-01,5,15
"""
u_cols=['customer_id', 'date', 'price', 'my_average']
myf = StringIO(myst)
import pandas as pd
my_df = pd.read_csv(StringIO(myst), sep=',', names = u_cols)
my_df=my_df.sort_values(list(my_df.columns))
如图所示:
https://trino.io/assets/blog/window-features/running-average-range.svg
我尝试编写了以下函数...
import numpy as np
def mylogic(myro):
mylist = list()
mydate = myro['date'][0]
for i in range(len(myro)):
if myro['date'][i] > mydate:
mylist.append(myro['price'][i])
mydate = myro['date'][i]
return np.mean(mylist)
但是它返回了一个关键错误(key_error)。
df['total_price'] = df.groupby(['customer_id', pd.Grouper(key='date', freq='1M')]).expanding(1).price.mean().array
- sammywemmy