https://codeperfectplus.com/plus-minus-problem-solving-hackerrank

plus_minus_test_case.py

def plusMinus(arr):
    countPositive = 0
    countNegative = 0
    n = len(arr)
    for i in range(n):
        if arr[i] > 0:
            countPositive += 1 
        elif arr[i] < 0:
            countNegative += 1
    countZero = n - countPositive-countNegative
    print(countPositive/n)
    print(countNegative/n)
    print(countZero/n)
    
 
def test_case_0():
    arr = [-4, 3, -9, 0, 4, 1]
    plusMinus(arr)

    
test_case_0()

# output

# 0.5
# 0.3333333333333333
# 0.16666666666666666