Eli Courtwright wrote: > I can tell that instancemethods can't have attributes added to them outside > of their class definition. Is this part of the Python language spec, or > just an implementation detail of CPython? You can't modify the attributes of an instance method. You have to modify the attribute of the function object. > I bring this up here because it makes writing certain class decorators much > more annoying. For example, if I want to write a class decorator that will > set "exposed=True" for every method of a class, I must resort to > shenanigans. No, you don't. You have to retrieve the function object from the instance method object. The example should shed some light on the problem: >>> class Root(object): ... def index(self): ... return "Hello World!" ... print type(index) ... index.exposed = True ... <type 'function'> >>> type(Root.index) <type 'instancemethod'> >>> Root.index.exposed True >>> Root.index.exposed = False Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'instancemethod' object has no attribute 'exposed' >>> Root.index.im_func <function index at 0x8354e64> >>> Root.index.im_func.exposed = False >>> Root.index.exposed False Christian
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