初学者的python代码卡住了，求解答

Question

Answer 1

data = []
while True:
    a = input('请输入任意一实数(结束输入，请输入stop):')
    if a == 'stop' and len(data) == 0:
        continue
    elif a == 'stop' and len(data) != 0:
        print(f'所输入数据总个数为:{len(data)}')
        print(f'所输入数据总和为:%.2f' % (sum(data)))
        print('所输入数据的平均值为:%.2f' % (sum(data) / len(data)))
        break
    if not a:
        continue
    data.append(float(a))