python TypeError: 'NoneType' object is not iterable

TypeError: 'NoneType' object is not iterable

问题代码:

def total_scores(dictinary):
    for number_ts in dictinary:
        scores_ts= np.sum(dictinary[number_ts])
        print(scores_ts)

img

传进去的字典是空的,不了迭代

dictinary 这个是什么类型的 确定是否有值