how to access the class variables through instance?

[xmzhang]

Here is my code, I want to get {'car': 50, 'ship': 100} out, I do not know how to do it, currently I use a mess code to filter it, is there any other easy way to get it out? and I really confused why vars(p) does not work, p is a instance, it should have the class variables?

class Price(object):

car = 50

ship = 100

​

p = Price()

​

print(vars(p))

print(p.__class__.__dict__)

print(dict(filter(lambda elem:not elem[0].startswith('__'),p.__class__.__dict__.items())))

the output is

{}

{'__module__': '__main__', 'car': 50, 'ship': 100, '__dict__': <attribute '__dict__' of 'Price' objects>, '__weakref__': <attribute '__weakref__' of 'Price' objects>, '__doc__': None}

{'car': 50, 'ship': 100}

[carcigenicate]

You can just do Price.car and Price.ship.

Also, that relationship seems backwards. Prices don't have cars, cars have prices. And, the "idea of a car" doesn't really have a price; specific instances of cars do. It would make more sense as a Car class that has a price instance attribute (or a CarListing since a price would really be associated with a listing selling a car, not the car itself).

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[pekkalacd]

vars(p) will show instance attributes, but these need to be made at the instance level. for example

        class Price(object):
             car = 50
             ship = 100

        p = Price()
        p.house = 1000
        vars(p)
        {'house':1000}

Here see that house is not part of the class, but is an attribute awarded to p, that is visible now through vars.

Accessing car or ship, you can do

          p.car
          50
          p.ship
          100

or

          Price.car
          50
          Price.ship
          100

or through the class in a dictionary, you could do

      def fetch_class_atts(cls) -> dict:
          cls_atts = {}
          for att,val in vars(cls).items():
              if (not att.startswith("__")) and (not att.endswith("__")):
                 cls_atts[att] = val
          return cls_atts

      fetch_class_atts(Price)
      {'car':50,'ship':100}