Instance cache for classes python

instance_cache.py

def instance_cached(meth):
    cached_name = '_' + meth.__name__
    @functools.wraps(meth)
    def _cached(self):
        if not hasattr(self, cached_name):
            setattr(self, cached_name, meth(self))
        return getattr(self, cached_name)
    return _cached