Return equivalent of `:` from function for indexing array

Question

I have a large array and a function that returns index lists into the array, i.e.,

import numpy

n = 500
a = numpy.random.rand(n)

def get_idx(k):
    # M         


        

Answer 1

Have a look at slice

def get_x():
    return slice(2)

a=list(range(100))
a[get_x()]

will return [0, 1]

UPDATE

And for your need get_x function should be

def get_x(k, n):
    return slice(n if k > 6 else k)

Update

as @Eric correctly noted it's better to pass None instead of n. So function would be:

def get_x(k):
    return slice(None if k > 6 else k)