python - Pypy 特定错误

Question

我有以下代码:

#!/usr/bin/env python
#!/usr/bin/env pypy

class my_components(object):
    COMP0 = 0
    COMP1 = 1
    COMP1 = 2
    __IGNORECOMP = -1

def attribute_dictionary(o):
    d = { }
    for attr in dir(o):
        if attr[:2] != '__':
            print o,attr
            d[attr] = o.__getattribute__(o, attr)
    return d

def main():
    print attribute_dictionary(my_components)

if __name__ == '__main__':
    main()

我用它来有效地在 python 中进行花哨的枚举。

它在 python 中运行良好，打印:

<class '__main__.my_components'> COMP0
<class '__main__.my_components'> COMP1
<class '__main__.my_components'> _my_components__IGNORECOMP
{'COMP0': 0, 'COMP1': 2, '_my_components__IGNORECOMP': -1}

但是，当我用 pypy 运行它时(切换前两行)它失败了:

<class '__main__.my_components'> COMP0
Traceback (most recent call last):
  File "app_main.py", line 53, in run_toplevel
  File "./pypy_Test.py", line 25, in <module>
    main()
  File "./pypy_Test.py", line 21, in main
    print attribute_dictionary(my_components)
  File "./pypy_Test.py", line 17, in attribute_dictionary
    d[attr] = o.__getattribute__(o, attr)
TypeError: unbound method __getattribute__() must be called with my_components instance as first argument (got type instance instead)

欢迎任何见解。

-谢谢

Answer 1

您正在调用 __getattribute__ 并传入 类，而不是该类的实例。来自__getattribute__ documentation :

Called unconditionally to implement attribute accesses for instances of the class.

事实上，在 cPython 中，类作为第一个参数完全有效，这是一个快乐的巧合；正式地，第一个参数应该是一个实例。