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                [toc] ## 元組的定義和特性 ### 定義: 與列表類似,只不過`[]`改成`()` ### 特性: 1. 可存放多個值和多種類型的值 2. 不可變,有序 3. 按照從左到右的順序定義元組元素,下標從0開始順序訪問 ### 用途 顯示的告訴別人活自己,這部分數據不能變,如連接數據庫的配置信息 ### 元組中的列表 元組本身不可變,但如果元組中包含其他可變元素,如列表,這些可變元素是可以改變的 ```python >>> ages = (11, 22, 33, [44,55]) >>> ages[2]='D' Traceback (most recent call last): File "<input>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> ages[3][0]='D' >>> ages (11, 22, 33, ['D', 55]) ``` ## 元組的創建與常用操作 元組除了數據不可變以外,其他諸如索引,切片和列表差不多 ### 創建 ``` ages = (11, 22, 33, 44, 55) #或 ages = tuple((11, 22, 33, 44, 55)) ``` ### 索引 ``` >>> ages = (11, 22, 33, 44, 55) >>> ages[0] 11 >>> ages[3] 44 >>> ages[-1] 55 ``` ### 切片  ``` >>> ages = (11, 22, 33, 44, 55) >>> ages[1:2] (22,) >>> ages[::2] (11, 33, 55) >>> ages[0:3] (11, 22, 33) ``` ### 循環 ``` >>> for age in ages: ... print(age) 11 22 33 44 55 ``` ### 長度 ``` >>> len(ages) 5 ``` ### 包含 ``` >>> 11 in ages True >>> 66 in ages False >>> 11 not in ages False ```
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