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                [TOC] >[success] # list--列表 ~~~ 1.列表是python中的基礎數據類型之一,其他語言中也有類似于列表的數據類型,比如js中叫數組,他是以[]括起來,每個元素以逗號隔開 列表相比于字符串,不僅可以儲存不同的數據類型,而且可以儲存大量數據,32位python的限制是 536870912 個元 素,64位python的限制是 1152921504606846975 個元素。而且列表是有序的,有索引值,可切片,方便取值。 2.列表也可以切片,對于切片理解可以看切片單獨章節 ~~~ >[danger] ##### 創建列表 ~~~ test_list = ["周","吳","鄭","王"] name_lists =list("周吳鄭王") print(test_list) print(name_lists) 打印結果: ['周', '吳', '鄭', '王'] ['周', '吳', '鄭', '王'] ~~~ >[danger] ##### append/ += -- 在列表末尾添加 ~~~ 1.使用+= 時注意,如果直接字符串添加,會將字符串拆解,推薦列表添加例 2.append 添加不會將可迭代對象拆開,也就是如果是列表或者字符串之類的會把一個整體保存進去 3.+=/ ~~~ ~~~ test_list = ["周","吳","鄭","王"] test_list.append("添加內容") print(test_list) test_list = ["周","吳","鄭","王"] test_list += ['添加內容'] print(test_list) test_list = ["周","吳","鄭","王"] test_list += '添加內容' print(test_list) 打印結果: ['周', '吳', '鄭', '王', '添加內容'] ['周', '吳', '鄭', '王', '添加內容'] ['周', '吳', '鄭', '王', '添', '加', '內', '容'] ~~~ >[danger] ##### insert -- 添加到指定位置 ~~~ test_list = ["周","吳","鄭","王"] test_list.insert(2,'insert') print(test_list) 打印結果: ['周', '吳', 'insert', '鄭', '王'] ~~~ >[danger] ##### extend -- 添加可迭代對象 ~~~ test_list = ["周","吳","鄭","王"] test_list.extend(['n','s']) print(test_list) 打印結果: ['周', '吳', '鄭', '王', 'n', 's'] ~~~ >[danger] ##### pop -- 根據位置刪除列表元素 ~~~ # 不填位置參數默認刪除最后一個 test_list = ["周","吳","鄭","王"] test_list.pop() print(test_list) # 填寫參數大于數組長度,會報錯 test_list = ["周","吳","鄭","王"] test_list.pop(1) print(test_list) 打印結果: ['周', '吳', '鄭'] ['周', '鄭', '王'] ~~~ >[danger] ##### remove -- 指定內容刪除 ~~~ # 不填和填寫不存在都會報錯 test_list = ["周","吳","鄭","王"] test_list.remove("周") print(test_list) 打印結果: ['吳', '鄭', '王'] ~~~ >[danger] ##### clear -- 清空列表中的內容 ~~~ test_list = ["周","吳","鄭","王"] test_list.clear() print(test_list) 打印機結果: [] ~~~ >[danger] ##### del -- 刪除列表 ~~~ test_list = ["周","吳","鄭","王"] del test_list ~~~ >[danger] ##### 切片/角標 -- 指定替換列表中內容 ~~~ # 把切片指定內容去掉,把賦值內容進行迭代加入 test_list = ["周","吳","鄭","王"] test_list[0:3] = ["w","s"] print(test_list) 打印結果: ['w', 's', '王'] test_list = ["周","吳","鄭","王"] test_list[0] = ["w","s"] print(test_list) 打印結果: [['w', 's'], '吳', '鄭', '王'] ~~~ >[danger] ##### index -- 查詢特定值所在的位置 ~~~ # 想查詢列表中某個值的位置時用index()列 name_list = ["周","吳","鄭","王"] print(name_list.index("王")) 打印結果: 3 ~~~ >[danger] ##### in -- 判斷值是否存在 ~~~ # 判斷某個值是否存在列表中用in例: name_list = ["周","吳","鄭","王"] print("王" in name_list) 打印結果 True ~~~ >[danger] ##### count -- 判斷記錄值出現的次數 ~~~ # 當想判斷列表中,一個值出現的次數的時候count例: name_list = ["周","周","吳","鄭","王"] print(name_list.count("周")) 打印結果 2 ~~~ >[danger] ##### join -- 將列表轉換成字符串 ~~~ # 我們想把列表中的內容,整理成字符串輸出可以使用join例: name_list = ["周","周","吳","鄭","王"] print(",".join(name_list)) 打印結果: 周,周,吳,鄭,王 ~~~ >[danger] ##### sort -- 重新排列元素 ~~~ # 當我們想吧列表中的元素,默認按照升序排列sort()列: num_list = [5,7,3,6,2,9,4] num_list.sort() print(num_list) 打印結果: [2, 3, 4, 5, 6, 7, 9] 降序排列可以使用num_list.sort(reverse=True),當然python也自帶方法可以用來排序sorted(),其中sort不帶返回值,sorted()帶返回值 ~~~ >[danger] ##### len -- 獲取長度 ~~~ # len -- 用來返回字符串,元組,列表等長度的例: A = "ssss" print(len(A)) 打印結果: 4 ~~~ >[danger] ##### reverse -- 反轉 ~~~ name_list = ["周","吳","鄭","王"] name_list.reverse() print(name_list) 打印結果: ['王', '鄭', '吳', '周'] ~~~
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