DataFrame sorting based on a function of multiple column values

Question

Based on python, sort descending dataframe with pandas:

Given:

from pandas import DataFrame
import pandas as pd

d = {\'x\':[2,3,1,4,5],
     \'y\':[         


        

Answer 1

You can create a temporary column to use in sort and then drop it:

df.assign(f = df['one']**2 + df['two']**2).sort_values('f').drop('f', axis=1)
Out: 
  letter  one  two
2      b    1    3
3      b    4    2
1      a    3    4
4      c    5    1
0      a    2    5