问题描述
1>创建一个嵌套字典，其中包含您在秋季和春季学期中今年正在做的学科的学科编号。 换句话说，您应该有一个带有2个键的字典，“秋天”和“春天”，并且与这些键关联的值本身应该是字典，其中键是主题编号，值是主题名称。
2>编写一个for循环，以打印出您在秋季完成的科目编号。
这就是我所拥有的
my_subjects = {"Autumn": {37315:"Data", 34567:"Sci"}, "Spring": {23456:"Eng", 45879:"Math"}}
for season, season.subjects in my_subjects.items():
print("\n Autumn Subject Numbers", season)
for key in season.subjects:
print(key)
但收到一个错误
AttributeError Traceback (most recent call last)
<ipython-input-208-b1fceae351e6> in <module>()
5
6
----> 7 for season, season.subjects in my_subjects.items():
8 print("\n Autumn Subject Numbers", season)
9
AttributeError: 'str' object has no attribute 'subjects'
1楼
随着.
运营商season.subjects您试图访问的subjects属性的season目标，它没有这样的属性。
您应该将my_subjects.items()返回的元组中第二个项目的值分配给单独的变量：
for season, subjects in my_subjects.items():
if season == 'Autumn':
print("Autumn Subject Numbers:", ', '.join(map(str, subjects)))
输出：
Autumn Subject Numbers: 37315, 34567
2楼
试试这个
my_subjects = {"Autumn": {37315:"Data", 34567:"Sci"}, "Spring": {23456:"Eng", 45879:"Math"}}
for season, data in my_subjects.items():
print("\n Autumn Subject Numbers", season)
for key in data:
print(key)
3楼
这个怎么样 ？
new_dict = {}
for k, v in my_subjects.items():
for x, z in v.items():
if k not in new_dict:
new_dict[k] = [x]
else:
new_dict[k].append(x)
print(new_dict)
{'Autumn': [37315, 34567], 'Spring': [23456, 45879]}