Dictionary value is property()

[nvj944]

I'm trying to subclass a dict object to create an object where some key values = 'property(fget, fset, fdel, doc)'. For some reason when I get the dictionary key a 'property object' is return instead of the result of the 'fget' function.

class mydict(dict):

    def __init__(self, arg):
        self['a'] = arg
        self['b'] = property(self.get_b)
    
    def get_b(self):
        return self['a']

d = mydict(5)

print d['a'] # Returns 5
print d['b'] # Incorrect. Returns <property obeject>. Should return 5.
print d['b'].fget() # Returns 5. Correct

[bvdet]

Function property should work something like this:

class mydict(dict):

    def __init__(self, arg):
        self['a'] = arg
        self.set_b()

    def set_b(self):
        self['b'] = self['a']
    
    def get_b(self):
        return self['a']

    b = property(set_b, get_b)

d = mydict(5)

>>> d['a']
5
>>> d['b']
5
>>> d['a'] = 12
>>> d['b']
5
>>> d.set_b()
>>> d['b']
12
>>> d['b']=100
>>> d['b']
100
>>>

Calling property is returning a property object and assigning it to key 'b' in your code.