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                ### 導航 - [索引](../genindex.xhtml "總目錄") - [模塊](../py-modindex.xhtml "Python 模塊索引") | - [下一頁](buffer.xhtml "緩沖協議") | - [上一頁](mapping.xhtml "Mapping Protocol") | - ![](https://box.kancloud.cn/a721fc7ec672275e257bbbfde49a4d4e_16x16.png) - [Python](https://www.python.org/) ? - zh\_CN 3.7.3 [文檔](../index.xhtml) ? - [Python/C API 參考手冊](index.xhtml) ? - [抽象對象層](abstract.xhtml) ? - $('.inline-search').show(0); | # 迭代器協議 迭代器有兩個函數。 int `PyIter_Check`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*o*)返回 true , 如果對象 *o* 支持迭代器協議的話。 [PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyIter_Next`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*o*)*Return value: New reference.*返回迭代 *o* 的下一個值。對象必須是一個迭代器(取決于調用者判斷),如果沒有剩下的值了,就返回 *NULL* , 而不是例外。如果獲取項的時候發生了一個錯誤,就返回 *NULL* 并從例外傳遞。 要為迭代器編寫一個一個循環,C代碼應該看起來像這樣 ``` PyObject *iterator = PyObject_GetIter(obj); PyObject *item; if (iterator == NULL) { /* propagate error */ } while (item = PyIter_Next(iterator)) { /* do something with item */ ... /* release reference when done */ Py_DECREF(item); } Py_DECREF(iterator); if (PyErr_Occurred()) { /* propagate error */ } else { /* continue doing useful work */ } ``` ### 導航 - [索引](../genindex.xhtml "總目錄") - [模塊](../py-modindex.xhtml "Python 模塊索引") | - [下一頁](buffer.xhtml "緩沖協議") | - [上一頁](mapping.xhtml "Mapping Protocol") | - ![](https://box.kancloud.cn/a721fc7ec672275e257bbbfde49a4d4e_16x16.png) - [Python](https://www.python.org/) ? - zh\_CN 3.7.3 [文檔](../index.xhtml) ? - [Python/C API 參考手冊](index.xhtml) ? - [抽象對象層](abstract.xhtml) ? - $('.inline-search').show(0); | ? [版權所有](../copyright.xhtml) 2001-2019, Python Software Foundation. Python 軟件基金會是一個非盈利組織。 [請捐助。](https://www.python.org/psf/donations/) 最后更新于 5月 21, 2019. [發現了問題](../bugs.xhtml)? 使用[Sphinx](http://sphinx.pocoo.org/)1.8.4 創建。
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