在python中定义字典获取TypeError：unhashable类型：'dict'

Question

i am trying to create a dictionary like something below:

frnd_detail1 = {
    {'name':'AD', 'age': 30}, {'name':'AKB', 'age':90},  {'name':'SD', 'age':40}
}

but i am getting the below error message as:

File "<ipython-input-72-a0d88fef112d>", line 4, in <module>
    {'name':'SD', 'age':40}

TypeError: unhashable type: 'dict'

why it is so, please provide some details

Answer 1

You are creating a set (by accident I guess) by surrounding your dictionaries with curly braces {} .

In Python you can create sets using {} like this:

>>> my_set = {1,2,3}
>>> print(type(my_set))
<type 'set'>

Sets can only have values that are hashable. A dict isn't hashable which is why you get the error. You might want to create a list instead by replacing your outer {} with [] like this:

frnd_detail1 = [{'name': 'AD', 'age': 30}, {'name': 'AKB', 'age': 90}, {'name': 'SD', 'age': 40}]

Answer 2

I guess you want to create a dictionary of dictionaries or list of dictionaries.

If its a dict of dicts, then you need to give a key for its value, and not just ut each dictionary independently.

If its a list of dicts, you can append each dict into a list.