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                # assert語句 `assert`語句用來聲明某個條件是真的。例如,如果你非常確信某個你使用的列表中至少有一個元素,而你想要檢驗這一點,并且在它非真的時候引發一個錯誤,那么`assert`語句是應用在這種情形下的理想語句。當assert語句失敗的時候,會引發一個`AssertionError`。 ``` >>> mylist = ['item'] >>> assert len(mylist) >= 1 >>> mylist.pop() 'item' >>> assert len(mylist) >= 1 Traceback (most recent call last): ??File "<stdin>", line 1, in ? AssertionError ```
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