Codality Python MaxProductOfThree练习出现TypeError: 'function' object is not subscriptable错误的修复请求

Hey there, let's break down and fix the error you're seeing:

The Root Cause #

That TypeError: 'function' object is not subscriptable happens because you tried to call your solution function using square brackets [] instead of the required parentheses () for function calls. On top of that, you also forgot to wrap your input array in square brackets when passing it in.

Fixed Code #

Here's the corrected version of your code:

def solution(A):
    A.sort()
    N = len(A)
    # Case 1: Two smallest negatives (their product is positive) * largest positive
    P1 = A[N-1] * A[0] * A[1]
    # Case 2: Product of the three largest numbers
    P2 = A[N-1] * A[N-2] * A[N-3]
    return max(P1, P2)

# Fixed function call with parentheses and properly formatted array
print(solution([4,2,2,5,1,5,8]))

Quick Notes on Your Logic #

Great job on the core logic here! Sorting the array and checking those two cases covers all possible scenarios for the maximum triplet product:

1. When two large negative numbers multiply to a big positive, then multiplied by the largest positive in the array
2. When the three largest positive numbers give the biggest product

This works for all valid input arrays (non-empty, as per the problem statement). For example, if you test with the sample input [-3, 1, 2, -2, 5, 6], the function correctly returns 60.

内容的提问来源于stack exchange，提问作者user12253044