[SOLVED] Ranking only positive numbers in a list , and negative number should replace with -1 in Pandas

Issue

Reproducible code :

import numpy as np
lst =  [-69,-68,-58,-39,-18,-11,-10,-9,-8,0,2,7,7,21,31,31,34,46,49,89,128]

Tried the code:

sorted_list = [sorted(lst).index(x) for x in lst]
sorted_list

Expected output:

[-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

Solution

You can use either map or a list comprehension to replace every negative number with -1. This can be done with a conditional:

# list comprehension
l = [(-1 if x < 0 else x) for x in l]

# map
l = list(map(lambda x: -1 if x < 0 else 0, l))

Or if the numbers are integers, then -1 is the "highest" possible negative number, so you can use max:

# list comprehension
l = [max(-1, x) for x in l]

# map
l = list(map(lambda x: max(-1, x), l))

Then you can sort the resulting list with list.sort or sorted.

Final code:

def sorted_and_minus1(l):
    return sorted(max(-1, x) for x in l)

lst =  [-69,-68,-58,-39,-18,-11,-10,-9,-8,0,2,7,7,21,31,31,34,46,49,89,128]
sorted_lst = sorted_and_minus1(lst)
print(sorted_lst)
# [-1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 2, 7, 7, 21, 31, 31, 34, 46, 49, 89, 128]

Answered By – Stef

Answer Checked By – Candace Johnson (BugsFixing Volunteer)

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