取 pandas 中多列的平均值

Question

下面是我的数据框，我需要对每个组中的 cols 取平均值

data = [['Group 1',10,100],
['Group 1',20,80],
['Group 1',15,60],
['Group 1',10,120],
['Group 2',10,120],
['Group 2',20,130],
['Group 2',30,200],
['Group 2',40,250],
['Group 2',50,300]] 
df = pd.DataFrame(data, columns = ['Group','price','size'])

我想取每组内价格和尺寸的平均值。所以所需的输出看起来像

Group     price_avg size_avg 
Group 1    13.75     90
Group 2    30        200

谢谢。

Answer 1

您尝试过 .agg 或 .transform 吗？

df.groupby('Group').agg(mean)
or 
df.groupby('Group').transform(mean, axis=1)

Answer 2

df.groupby('Group').agg(
    price_avg=('price', 'mean'),
    size_avg=('size', 'mean')
)

Group   price_avg   size_avg
Group 1 13.75       90
Group 2 30.0        200

取 pandas 中多列的平均值

Take mean of more than one columns in pandas

mean

pandas