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                [TOC] ## 一、元組基礎 **01 作用** ``` 1. 元組和列表?樣,都可?于存儲多個數據 2. 有些數據在存儲之后就不能發?改變 3. 通過元組可以存放多個數據,且這些數據不會被修改 ``` **02 定義** ``` # 1 字?量 tuple_1 = (1, 2) # 2 實例化 tuple_2 = tuple() # 3 只有?個值的元組 tuple_3 = (1, ) ``` > 注:如果元組中只有一個數據,要求后面也要加 逗號, 否則影響數據類型 <br /> ## 二、元組常見操作 **01 下標查找元素** * 功能:返回指定下標對應的元素 * 語法: **元組[下標]** * 示例: ``` tuple1 = (1, 2, 3) print(tuple1[1]) # 2 ``` **02 index** * 功能:返回某個數據出現的位置下標 * 語法: **元組.index(被測數據)** * 示例: ``` tuple1 = (1, 2, 3) print(tuple1.index(2)) # 1 ``` **03 count** * 功能:統計某個數據出現的次數 * 語法: **列表.count(被測數據)** * 示例: ``` tuple1 = (1, 2, 3) print(tuple1.count(3)) # 1 ``` **04 len** * 功能:返回目標元組的長度 * 語法:**len(元組)** * 示例: ``` tuple1 = (1, 2, 3) print(len(tuple1)) # 3 ```
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