runtime.py 文件源码

def __getattr__(self, key):
        if key in self.callables:
            val = self.callables[key]
        elif hasattr(self.module, key):
            callable_ = getattr(self.module, key)
            val = compat.partial(callable_, self.context)
        elif self.inherits:
            val = getattr(self.inherits, key)
        else:
            raise AttributeError(
                    "Namespace '%s' has no member '%s'" %
                    (self.name, key))
        setattr(self, key, val)
        return val