例如 沒有 com 用法 可能 hub http none --

從語法上來看，協程和生成器類似，都是定義體中包含yield關鍵字的函數。yield在協程中的用法： 在協程中yield通常出現在表達式的右邊，例如：datum = yield,可以產出值，也可以不產出--如果yield關鍵字後面沒有表達式，那麽生成器產出None. 協程可能從調用方接受數據，調用方是

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