Python Forum

import pandas as pd
df = pd.read_csv('Instances.csv', header = 1)

def Knapsack(K,s,v,n):

    # 3 & 4

    x = [0] * n

    z = 0


    # 5

    R = []

    for i in range(n):

        R.append((i,v[i]/s[i]))

    print(R)

    # 6

    R.sort(reverse=True, key=lambda x:x[1])
    print(R)

    # reorder original lists as stated in question

    new_s = []

    new_v = []

    

    for r in R:

        new_s.append(s[r[0]])

        new_v.append(v[r[0]])
        
 
    # 7 & 8

    u = 0

    i = 0


    # 9+

    while u <= K and i < n:

        if new_s[i] + u <= K:

            x[i] = 1

            u = u + new_s[i]

            z = z + new_v[i]

        elif new_s[i] + u > K:

            x[i] = (K-u)/(new_s[i])

            u = u + (new_s[i] * x[i])

            z = z + (new_v[i] * x[i])


        i = i + 1

    return (x, z)

# To test above function 
v = df['Value']
s = df['Size']
K = df['Knapsack Capacity'][0]
n = len(v)
print(Knapsack(K,s,v,n))

Output:
[(0, 0.6896929824561403), (1, 0.4934409687184662), (2, 0.058635394456289985), (3, 1.3706070287539935), (4, 2.553846153846154), (5, 2.009259259259259), (6, 7.236363636363635), (7, 0.9710806697108066), (8, 0.7977412731006159), (9, 0.33176838810641623), (10, 0.6615168539325842), (11, 0.18432203389830507), (12, 3.1095890410958904), (13, 37.400000000000006), (14, 0.2038216560509554), (15, 1.2998137802607075), (16, 0.602125147579693), (17, 0.541371158392435), (18, 1.309667673716012), (19, 1.2723658051689861), (20, 1.791489361702128), (21, 0.7649164677804295), (22, 2.9087591240875916), (23, 4.951807228915663), (24, 1.4912836767036448)]
[(13, 37.400000000000006), (6, 7.236363636363635), (23, 4.951807228915663), (12, 3.1095890410958904), (22, 2.9087591240875916), (4, 2.553846153846154), (5, 2.009259259259259), (20, 1.791489361702128), (24, 1.4912836767036448), (3, 1.3706070287539935), (18, 1.309667673716012), (15, 1.2998137802607075), (19, 1.2723658051689861), (7, 0.9710806697108066), (8, 0.7977412731006159), (21, 0.7649164677804295), (0, 0.6896929824561403), (10, 0.6615168539325842), (16, 0.602125147579693), (17, 0.541371158392435), (1, 0.4934409687184662), (9, 0.33176838810641623), (14, 0.2038216560509554), (11, 0.18432203389830507), (2, 0.058635394456289985)]
([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0.585215605749487, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0], 8.546712525667353)
 

in the solution the [1,1,1... does not correspond to my original indexed items, it corresponds to the updated version so [1,1,1.. corresponds to 13,6,23. but i need the solution to show for the original

from your function name we can guess you are dealing with Knapsack problem, but you really need to explain what you try to achieve (expected output) and how the current output is different.
using only one-char variable named does not help too