How to get properties of object in python

Question

class ClassB:
    def __init__(self):
        self.b = "b"
        self.__b = "__b"

    @property
    def propertyB(self):
        return "B"

I know getattr,hasattr... can access the property. But why don't have the iterattr or listattr?

Expect result of ClassB object:

{'propertyB': 'B'}

Expect result of ClassB class:

['propertyB']

Thanks @juanpa.arrivillaga 's comment. vars(obj) and vars(obj.__class__) is different!

To get the attributes of an object, use `vars(obj)`. Note, `property` objects belong to the *class* not the *instance* — juanpa.arrivillaga, Oct 01 '19 at 02:13
And note, your `property` doesn't know that it will always return `B`. — juanpa.arrivillaga, Oct 01 '19 at 02:14
@juanpa.arrivillaga if I know the name of property, I can get the value by `getattr` — JustWe, Oct 01 '19 at 02:18
@juanpa.arrivillaga In that case, I think the value shall be same as `getattr(b_object, 'randomProperty')`. — JustWe, Oct 01 '19 at 02:27

score 4 · Accepted Answer · answered Oct 01 '19 at 02:18

4

Use the built-in vars as follows:

properties = []
for k,v in vars(ClassB).items():
    if type(v) is property:
        properties.append(k)

Using a list-comprehension:

>>> [k for k,v in vars(ClassB).items() if type(v) is property]
['propertyB']

answered Oct 01 '19 at 02:18

lmiguelvargasf

score 1 · Answer 2 · answered Oct 01 '19 at 02:21

To list propeties of a python Class you can use __dict__

Example

>>> class C(object):
x = 4

>>> c = C()
>>> c.y = 5
>>> c.__dict__
{'y': 5}

2 Answers2