HackerRank Plus Minus ~ no response on stdout ~

Can someone please explain why hackerrank does not accept this code for python?

def plusMinus(arr):
    positive = "{0:.6f}".format(sum(1 for i in arr if i > 0) / len(arr))
    negative = "{0:.6f}".format(sum(1 for i in arr if i < 0) / len(arr))
    zero = "{0:.6f}".format(sum(1 for i in arr if i == 0) / len(arr))
    return "n".join([positive, negative, zero])

It gives me this error: ~ no response on stdout ~

Answer

You will notice that on HackerRank your function is called without doing anything with the return value. The template code looks like this:

if __name__ == '__main__':
    n = int(input())

    arr = list(map(int, input().rstrip().split()))

    plusMinus(arr)

Moreover, the description says:

Print the decimal value of each fraction on a new line.

So you should print the result. And since your code doesn’t print anything, the error message is what could be expected.

Instead of return, do:

print("n".join([positive, negative, zero]))