小鲨鱼2018

2021年2月24日

摘要： 1、 >>> a = ["aa","bb","cc","dd","ee"] >>> temp = a[1] ## 引入变量 >>> temp 'bb' >>> a[1] = a[3] >>> a ['aa', 'dd', 'cc', 'dd', 'ee'] >>> a[3] = temp > 阅读全文

posted @ 2021-02-24 09:13 小鲨鱼2018 阅读(4098) 评论(0) 推荐(0)

python中统计列表元素出现的次数

摘要： >>> a = ["ee","cc","aa","ff","aa","cc","dd","ee","dd","ee","aa","aa","bb"] ##生成列表 >>> a ['ee', 'cc', 'aa', 'ff', 'aa 阅读全文

posted @ 2021-02-24 08:31 小鲨鱼2018 阅读(397) 评论(0) 推荐(0)

python中给列表元素去重复

摘要： 1、 >>> a = ["aa","cc","aa","bb","bb","aa","dd","ee"] >>> a ['aa', 'cc', 'aa', 'bb', 'bb', 'aa', 'dd', 'ee'] >>> "aa" in 阅读全文

posted @ 2021-02-24 08:22 小鲨鱼2018 阅读(129) 评论(0) 推荐(0)

python中如何给列表排序

摘要： >>> a = ["dd","cc","aa","bb"] >>> a ['dd', 'cc', 'aa', 'bb'] >>> b = sorted(a) ## 排序并赋值给b >>> b ['aa', 'bb', 'cc', 'dd'] >>> a ['dd', 'cc&# 阅读全文

posted @ 2021-02-24 08:18 小鲨鱼2018 阅读(245) 评论(0) 推荐(0)

python中删除列表元素

摘要： >>> a = ["aa","bb","cc","dd","ee","ff","gg","hh"] >>> a ['aa', 'bb', 'cc', 'dd', 'ee', 'ff', 'gg', 'hh'] >>> a.pop() ## pop删除阅读全文

posted @ 2021-02-24 08:10 小鲨鱼2018 阅读(83) 评论(0) 推荐(0)

python中如何给列表添加元素

摘要： >>> a = ["aa","bb","cc"] ## 创建列表 >>> a ['aa', 'bb', 'cc'] >>> a.append("dd") ## append添加 >>> a ['aa', 'bb', 'cc', 'dd'] >>> a.extend(["ee"]) >> 阅读全文

posted @ 2021-02-24 08:06 小鲨鱼2018 阅读(593) 评论(0) 推荐(0)

2021年2月23日

python中实现列表倒序排列

摘要： 1、 >>> a = list(range(1,11)) ## 生成列表 >>> a [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> a[::-1] ## 倒序排列 [10, 9, 8, 7, 6, 5, 4, 3, 2, 1] >>> a [1, 2, 3, 4, 5, 6 阅读全文

posted @ 2021-02-23 22:33 小鲨鱼2018 阅读(5264) 评论(0) 推荐(0)

python中如何清空列表

摘要： 1、>>> a = ["aa","bb","cc","dd"] ## 生成列表 >>> a ['aa', 'bb', 'cc', 'dd'] >>> a = [] ## 清空列表 >>> a []2、 >>> a = ["aa","bb","cc","dd"] ## 生成列表 > 阅读全文

posted @ 2021-02-23 22:25 小鲨鱼2018 阅读(475) 评论(0) 推荐(0)

python中提取列表的奇数元素和偶数元素

摘要： >>> a = list(range(1,21)) ## 生成列表 >>> a [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] >>> a[::2] ## 提取第奇数元素 [1, 3, 5, 7, 9, 阅读全文

posted @ 2021-02-23 22:22 小鲨鱼2018 阅读(8014) 评论(0) 推荐(0)

python中如何提取列表的前几个元素和后几个元素

摘要： >>> a = list(range(1,21)) ##生成列表 >>> a [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] >>> a[:10] ## 提取前10个元素 [1, 2, 3, 4, 5, 阅读全文

posted @ 2021-02-23 22:19 小鲨鱼2018 阅读(17773) 评论(0) 推荐(0)

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