考虑
classinstancemethod从formenpre重用装饰器。
https://bitbucket.org/formenpre/official-
formenpre/src/06d52c5b33c9/formenpre/declarative.py
class classinstancemethod(object): """ Acts like a class method when called from a class, like an instance method when called by an instance. The method should take two arguments, 'self' and 'cls'; one of these will be None depending on how the method was called. """ def __init__(self, func): self.func = func def __get__(self, obj, type=None): return _methodwrapper(self.func, obj=obj, type=type)class _methodwrapper(object): def __init__(self, func, obj, type): self.func = func self.obj = obj self.type = type def __call__(self, *args, **kw): assert 'self' not in kw and 'cls' not in kw, ( "You cannot use 'self' or 'cls' arguments to a " "classinstancemethod") return self.func(*((self.obj, self.type) + args), **kw) def __repr__(self): if self.obj is None: return ('<bound class method %s.%s>' % (self.type.__name__, self.func.func_name)) else: return ('<bound method %s.%s of %r>' % (self.type.__name__, self.func.func_name, self.obj))
