Why do data descriptors (e.g. properties) take priority over instance attributes?

[Peter J. Holzer]

On 2018-12-17 21:57:22 +1100, Paul Baker wrote:
>     class C:
>         def __init__(self):
>             self.__dict__['a'] = 1
> 
>         @property
>         def a(self):
>             return 2
> 
>     o = C()
>     print(o.a)  # Prints 2

What version of Python is this? I get a different result:

    Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
    [GCC 8.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> class C:
    ...   def __init__(self):
    ...     self.__dict__['a'] = 1
    ...     @property
    ...     def a(self):
    ...       return 2
    ... 
    >>> o = C()
    >>> o.a
    1

	hp

-- 
   _  | Peter J. Holzer    | we build much bigger, better disasters now
|_|_) |                    | because we have much more sophisticated
| |   | hjp at hjp.at         | management tools.
__/   | http://www.hjp.at/ | -- Ross Anderson <https://www.edge.org/>
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