Python 创建一组词典时出错

我已经编写了创建一组词典的代码。当我期望输出元素以有意义的格式打印时，我得到了一个错误

sets_of_dictionary_ele  = {{"name": "Rolf", "grade": "First"},
                           {"name": "Mark", "grade": "Second"},
                           {"name": "John", "grade": "Third"},
                           {"name": "Halen", "grade": "Fourth"}
                           } 

for k,v in sets_of_dictionary_ele:

    name = k["name"]
    grade = v["grade"]

    print(f"{name} has scored {grade} grade.")

---

出现此错误的原因是，您正在用花括号包装dicts，这会试图创建一个集合。字典是不易损坏的，所以它们不能是集合的成员。您可以使用方括号创建dict列表，并相应地更改for循环，如下所示：

sets_of_dictionary_ele  = [{"name": "Rolf", "grade": "First"},
                           {"name": "Mark", "grade": "Second"},
                           {"name": "John", "grade": "Third"},
                           {"name": "Halen", "grade": "Fourth"}
                           ]

for k in sets_of_dictionary_ele:
    name = k["name"]
    grade = k["grade"]

    print(f"{name} has scored {grade} grade.")

或者，您可以将

set\u of_dictionary\u ele

变量的格式更改为dictionary，并执行以下操作：

sets_of_dictionary_ele = {'Rolf': 'First',
                          'Mark': 'Second',
                          'John': 'Third',
                          'Halen': 'Fourth'}

for k, v in sets_of_dictionary_ele.items():
    name = k
    grade = v
    print(f"{name} has scored {grade} grade.")

---

这将有助于了解您所遇到的错误-猜测这是因为您无法将多个对象像字典一样存储在一个集合中？这是否回答了您的问题？