R's order equivalent in python

Question

Any ideas what is the python's equivalent for R's order ?

order(c(10,2,-1, 20), decreasing = F) 
# 3 2 1 4

Answer 1

In numpy there is a function named argsort

import numpy as np
lst = [10,2,-1,20]
np.argsort(lst)
# array([2, 1, 0, 3]) 

Note that python list index starting at 0 while starting at 1 in R.

Answer 2

It is numpy.argsort()

import numpy
a = numpy.array([10,2,-1, 20])
a.argsort()

# array([2, 1, 0, 3])

and if you want to explore the decreasing = T option. You can try,

(-a).argsort()

#array([3, 0, 1, 2])