Binary Search - The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all()

Question

Having trouble with my binary search where my comparison operators is arent working for when using data from my series, any ideas? Error is coming up on if el == value:

def binarySearch(elements, value):
left, right = 0, len(elements) - 1

while left <= right:
    middle = (left + right) // 2
    el = elements[middle]
    el = str(el)
    **if el == value:**
        return middle

    if elements[middle] < value:
        left = middle + 1
    elif elements[middle] > value:
        right = middle - 1