Python中的元组索引超出范围

def max_logged_in(interval_lst,T):
    startArr, endArr = zip(*interval_lst)
    i = 0
    j = 0
    maxOverlap = 0
    currentOverlap = 0
    while (i<T and j<T):
        if (startArr[i] < endArr[j]):
            currentOverlap = currentOverlap + 1
            maxOverlap = max(maxOverlap, currentOverlap)
            i = i + 1
        else:
            currentOverlap = currentOverlap - 1
            j = j + 1
def max_logged_in(interval_lst,T):
    startArr