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              深入Python列表-腳本操作符及拼接截取操作【每日一個知識點第165期-Python】

              序列是Python中最基本的數據結構,Python有6個序列的內置類型,但最常見的是列表和元組。今天我們來帶大家深入學習Python列表知識,首先我們要學習的是列表更新和元素刪除的操作。


              列表對 + 和 * 的操作符與字符串相似。+ 號用于組合列表,* 號用于重復列表。

              如下所示:

              Python 表達式 結果 描述
              len([1, 2, 3]) 3 長度
              [1, 2, 3] + [4, 5, 6] [1, 2, 3, 4, 5, 6] 組合
              [‘Hi!’] * 4 [‘Hi!’, ‘Hi!’, ‘Hi!’, ‘Hi!’] 重復
              3 in [1, 2, 3] True 元素是否存在于列表中
              for x in [1, 2, 3]: print(x, end=” “) 1 2 3 迭代

              Python列表截取與拼接

              Python的列表截取與字符串操作類型,如下所示:

              L=[Google, Runoob, Taobao]

              操作:

              Python 表達式 結果 描述
              L[2] ‘Taobao’ 讀取第三個元素
              L[-2] ‘Runoob’ 從右側開始讀取倒數第二個元素: count from the right
              L[1:] [‘Runoob’, ‘Taobao’] 輸出從第二個元素開始后的所有元素
              >>>L=[‘Google’, ‘Runoob’, ‘Taobao’]
              >>> L[2]
              ‘Taobao’
              >>> L[-2]
              ‘Runoob’
              >>> L[1:]
              [‘Runoob’, ‘Taobao’]
              >>>

              列表還支持拼接操作:

              >>>squares = [1, 4, 9, 16, 25]
              >>> squares + [36, 49, 64, 81, 100]
              [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

              Python入門每日一個知識點》欄目是馬哥教育Python年薪20萬+的學員社群特別發起,分享Python工具、Python語法、Python項目等知識點,幫助大家快速的了解Python學習,快速步入Python高薪的快車道。

              【13萬+人學習】《Python自動化全能開發從入門到精通》python基礎教程筆記全放送

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