我有一个namedtuple 变量，它代表应用程序的版本（它的编号和类型）。但我想对值进行一些限制：
Version = namedtuple("Version", ["app_type", "number"])
version = Version("desktop") # i want only "desktop" and "web" are valid app types
version = Version("deskpop") # i want to protect from such mistakes
我现在的解决方案是没有方法的原始类：
class Version:
def __init__(self, app_type, number):
assert app_type in ('desktop', 'web')
self.app_type = app_type
self.number = number
它是pythonic吗？是否矫枉过正？