英文:
Error when creating a set of dictionaries
问题
我已经编写了代码来创建一组字典。我期望输出元素以有意义的格式打印出来，但是我遇到了一个错误。
sets_of_dictionary_ele = [{"name": "Rolf", "grade": "First"},
{"name": "Mark", "grade": "Second"},
{"name": "John", "grade": "Third"},
{"name": "Halen", "grade": "Fourth"}
}
for dictionary in sets_of_dictionary_ele:
name = dictionary["name"]
grade = dictionary["grade"]
print(f"{name} has scored {grade} grade.")
以上是修复后的代码。
英文:
I have written code to create a set of dictionaries. Where I am expecting the output elements to be printed in a meaningful format, however, I am getting an error.
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.")
答案1
得分: 2
你出现这个错误的原因是因为你使用花括号包装字典，这会尝试创建一个集合。字典是不可哈希的，因此不能作为集合的成员。你可以使用方括号创建字典列表，并相应地修改你的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，你可以将你的 sets_of_dictionary_ele 变量的格式修改为字典，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.")
英文:
The reason you get this error is because you are wrapping the dicts with curly brackets, which attempts to make a set. Dictionaries are unhashable, so they can't be members of sets. You can either use square brackets to make a list of dicts, and alter your for loop accordingly, as follows:
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.")
Or, you can alter the format of your sets_of_dictionary_ele variable to a dictionary and do the following:
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.")
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