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              【Python面試真題】- 迭代器和生成器的區別

              【Python面試真題】- 迭代器和生成器的區別

              1)迭代器是一個更抽象的概念,任何對象,如果它的類有next方法和iter方法返回自己本身。對于string、list、dict、tuple等這類容器對象,使用for循環遍歷是很方便的。在后臺for語句對容器對象調用iter()函數,iter()是python的內置函數。iter()會返回一個定義了next()方法的迭代器對象,它在容器中逐個訪問容器內元素,next()也是python的內置函數。在沒有后續元素時,next()會拋出一個StopIteration異常

              2)生成器(Generator)是創建迭代器的簡單而強大的工具。它們寫起來就像是正規的函數,只是在需要返回數據的時候使用yield語句。每次next()被調用時,生成器會返回它脫離的位置(它記憶語句最后一次執行的位置和所有的數據值)

              區別:生成器能做到迭代器能做的所有事,而且因為自動創建了__iter__()和next()方法,生成器顯得特別簡潔,而且生成器也是高效的,使用生成器表達式取代列表解析可以同時節省內存。除了創建和保存程序狀態的自動方法,當發生器終結時,還會自動拋出StopIteration異常



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