They’re not mandatory. Not all modules have infrastructure code, and not all have so complex business logic that would make the separation justified. The most important hint on introducing an infra-module is a need to unit test the Business-Module.
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，详情可参考电影
Number: All the pips in this space must add up to the number.
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with self._watch() as queue:，这一点在电影中也有详细论述