Object not accessible inside a function in Python

Question

I am a beginner in python and I am facing an issue.

Below is my code:

class LocalQueryDictionary(dict):
    def __init__(self):
        self = dict()

    def addvalue(self, key, value):
        self[key] = value

#Global definition of the object, "local_query_dict"

local_query_dict = LocalQueryDictionary()

def save_local_query(query_name_input, query_val_input):

    local_query_dict.addvalue(str(query_name_input.get()), str(query_val_input.get()))
    localQuery_listbox.insert(END, str(query_name_input.get()))

I am getting "AttributeError: 'dict' object has no attribute 'addvalue'".

Please help me on the same. Thanks in advance!!

Answer 1

If you are subclassing dict for a reason, just initialize it.

And for adding values you can try __setitem__

class LocalQueryDictionary(dict):
    def __init__(self):
        super().__init__()

    def addvalue(self, key, value):
        self.__setitem__(key, value)
    

Then

a = LocalQueryDictionary()
a.addvalue('product', 'Lorem')
a.addvalue('state', 'NY')
print(a)
#=> {'product': 'Lorem', 'state': 'NY'}

Answer 2

The conventional name 'self' is a reference to the class.

If I understand your intention correctly, then what you probably want is this:-

class LocalQueryDictionary(dict):
    def __init__(self):
        pass

    def addvalue(self, key, value):
        self[key] = value


lqd = LocalQueryDictionary()
lqd.addvalue('k', 'v')
print(lqd)