小鲨鱼2018

2021年2月25日

摘要： >>> a = "good" ##测试字符串 >>> a 'good' >>> type(a) <class 'str'> >>> a.center(1) ## 指定宽度1 'good' >>> a.center(10) ## 指定宽度10，默认使用空格填充 ' good ' >>> a.cente 阅读全文

posted @ 2021-02-25 09:16 小鲨鱼2018 阅读(1481) 评论(0) 推荐(0)

python中字符串的大小写转换

摘要： 1、 >>> a = "gooD" ##测试字符串 >>> a.lower() ##全部变为小写 'good' >>> a.upper() ## 全部变为大写 'GOOD' >>> a.casefold() ## 全部变为小写 'good' >>> a.capitalize() ## 首字母大写 ' 阅读全文

posted @ 2021-02-25 09:07 小鲨鱼2018 阅读(459) 评论(0) 推荐(0)

python中如何删除元组的元素

摘要： 1、 >>> a = ("aaa","bbb","ccc","ddd","eee","fff") >>> a[:2] + a[3:] ## 删除元素ccc ('aaa', 'bbb', 'ddd', 'eee', 'fff') >>> a[:2] + a[4:] ## 删除元素ccc和ddd ('a 阅读全文

posted @ 2021-02-25 08:42 小鲨鱼2018 阅读(1819) 评论(0) 推荐(0)

python中如何向元组中添加元素

摘要： 1、 >>> a = ("aaa","bbb","ccc","ddd","eee") >>> type(a) <class 'tuple'> >>> a[:2] + ("xxx",) + a[2:] ('aaa', 'bbb', 'xxx', 'ccc', 'ddd', 'eee') >> 阅读全文

posted @ 2021-02-25 08:27 小鲨鱼2018 阅读(18269) 评论(0) 推荐(0)

2021年2月24日

python中修改元组元素的值

摘要： 1、 >>> a = ("aaa","bbb","ccc","ddd","eee","fff") >>> type(a) <class 'tuple'> >>> id(a) 1360669254176 >>> a[2] = "xxx" Traceback (most recent call last 阅读全文

posted @ 2021-02-24 22:54 小鲨鱼2018 阅读(2318) 评论(0) 推荐(0)

python中修改列表元素的值

摘要： >>> a = ["aaa","bbb","ccc","ddd"] >>> a[1] = "xxx" ## 修改第二个元素 >>> a ['aaa', 'xxx', 'ccc', 'ddd'] >>> a[2:4] = ["mmm","nnn"] ## 修改第三和第四个元素 >>> a ['aaa 阅读全文

posted @ 2021-02-24 22:13 小鲨鱼2018 阅读(4495) 评论(0) 推荐(0)

python中输出变量

摘要： 1、 >>> a = 100 >>> b = 200 >>> print(a,b) 100 200 >>> print("the score is:",a) the score is: 100 >>> print(f"the score is:{a}") the score is:100 阅读全文

posted @ 2021-02-24 22:04 小鲨鱼2018 阅读(346) 评论(0) 推荐(0)

python中给列表元素去重复

摘要： 1、 >>> a = ["aaa","bbb","aaa","aaa","bbb","aaa","ccc","ddd","ddd"] >>> b = [] >>> for i in a: if i not in b: b.append(i) >>> b ## for循环去重复 ['aaa', 'bb 阅读全文

posted @ 2021-02-24 21:59 小鲨鱼2018 阅读(255) 评论(0) 推荐(0)

python中取列表相对于另一列表的唯一值

摘要： 1、 >>> a = ["aaa","bbb","ccc","ddd"] >>> b = ["ccc","ddd","eee","fff"] >>> c = [] >>> for i in a: if i not in b: c.append(i) >>> c ['aaa', 'bbb'] >>> 阅读全文

posted @ 2021-02-24 21:45 小鲨鱼2018 阅读(98) 评论(0) 推荐(0)

python中求列表的交集和并集

摘要： 1、 >>> a = ["aaa","bbb","ccc","ddd"] >>> b = ["ccc","ddd","eee","fff"] >>> c = a + b >>> c ['aaa', 'bbb', 'ccc', 'ddd', 'ccc', 'ddd', &# 阅读全文

posted @ 2021-02-24 21:38 小鲨鱼2018 阅读(1199) 评论(0) 推荐(0)

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