本文介绍了将groupby.agg中的参数传递给多个函数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

任何人都知道如何用多个函数在groupby.agg()中传递参数?



底线,我想用一个自定义函数,但我会用一个需要参数的内置函数来问我的问题。



假设:

 使用 lambda 函数:

  q = 0.22 
df1 = df.groupby('lvl_1')['value']。agg(['' min','max',lambda x:x.quantile(q)])
print(df1)
min max< lambda>
lvl_1
di 0.275401 0.530000 0.294589
fi 0.054363 0.848818 0.136555

或者可以创建 f 函数并为自定义列名设置名称:

  q = 0.22 
f = lambda x:x.quantile(q)
f .__ name__ ='custom_quantile'
df1 = df.groupby('lvl_1')['value']。 agg(['min','max',f])
print(df1)
min min custom_quantile
lvl_1
di 0.275401 0.530000 0.294589
fi 0.054363 0.848818 0.136555


Anyone knows how to pass arguments in a groupby.agg() with multiple functions?

Bottom line, I would like to use it with a custom function, but I will ask my question using a built-in function needing an argument.

Assuming:

import pandas as pd
import numpy as np
import datetime
np.random.seed(15)
day = datetime.date.today()
day_1 = datetime.date.today() - datetime.timedelta(1)
day_2 = datetime.date.today() - datetime.timedelta(2)
day_3 = datetime.date.today() - datetime.timedelta(3)
ticker_date = [('fi', day), ('fi', day_1), ('fi', day_2), ('fi', day_3),
               ('di', day), ('di', day_1), ('di', day_2), ('di', day_3)]
index_df = pd.MultiIndex.from_tuples(ticker_date, names=['lvl_1', 'lvl_2'])
df = pd.DataFrame(np.random.rand(8), index_df, ['value'])

How would I do this:

df.groupby('lvl_1').agg(['min','max','quantile'])

with, as argument for 'quantile':

q = 0.22
解决方案

Use lambda function:

q = 0.22
df1 = df.groupby('lvl_1')['value'].agg(['min','max',lambda x: x.quantile(q)])
print (df1)
            min       max  <lambda>
lvl_1
di     0.275401  0.530000  0.294589
fi     0.054363  0.848818  0.136555

Or is possible create f function and set it name for custom column name:

q = 0.22
f = lambda x: x.quantile(q)
f.__name__ = 'custom_quantile'
df1 = df.groupby('lvl_1')['value'].agg(['min','max',f])
print (df1)
            min       max  custom_quantile
lvl_1
di     0.275401  0.530000         0.294589
fi     0.054363  0.848818         0.136555

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08-11 13:57