Какие знаешь варианты lazy loading

def lazy_property(fn):
    attr_name = '_lazy_' + fn.__name__
    @property
    def _lazy_property(self):
        if not hasattr(self, attr_name):
            setattr(self, attr_name, fn(self))
        return getattr(self, attr_name)
    return _lazy_property

class LazyLoader:
    def __init__(self, loader_func):
        self.loader_func = loader_func
        self._loaded = None
    
    def __getattr__(self, name):
        if self._loaded is None:
            self._loaded = self.loader_func()
        return getattr(self._loaded, name)

def lazy_range(n):
    i = 0
    while i < n:
        yield i
        i += 1