Question: 
Write a function to find the ration of positive numbers in an array of integers.


Model's Code:
def positive_count(arr):
    positive_numbers = sum(1 for x in arr if x > 0)
    total_numbers = len(arr)
    return round(positive_numbers / total_numbers, 2) if total_numbers > 0 else 0



Sample Correct Code:
from array import array
def positive_count(nums):
    n = len(nums)
    n1 = 0
    for x in nums:
        if x > 0:
            n1 += 1
        else:
          None
    return round(n1/n,2)


Asserts:
assert positive_count([0, 1, 2, -1, -5, 6, 0, -3, -2, 3, 4, 6, 8])==0.54
assert positive_count([2, 1, 2, -1, -5, 6, 4, -3, -2, 3, 4, 6, 8])==0.69
assert positive_count([2, 4, -6, -9, 11, -12, 14, -5, 17])==0.56


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 442 of 974: 322/442 (72.85067873303167%): success