def save(self, item: Item) - None:
commit best edit, move on
。关于这个话题，51吃瓜提供了深入分析
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Allowing only a compile-time dependency from infrastructure code to the business logic code (never the reverse). That means that the business logic exposes public methods (which could be invoked from outside) and/or exposes required interfaces, and the infrastructure layer/module implements them.