Python中数组用法大全
发布时间:2020-12-17 17:25:45 所属栏目:Python 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 #!/usr/bin/env python## [SNIPPET_NAME: Lists 101]# [SNIPPET_CATEGORIES: Python Core]# [SNIPPET_DESCRIPTION: Basic and not so basic list oper
以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 #!/usr/bin/env python # # [SNIPPET_NAME: Lists 101] # [SNIPPET_CATEGORIES: Python Core] # [SNIPPET_DESCRIPTION: Basic and not so basic list operations] # [SNIPPET_AUTHOR: Bruno Girin <[email?protected]>] # [SNIPPET_LICENSE: GPL] # This snippet demonstrates how the basics on lists: how to create,add,# remove items,get items or slices,sort,etc. # # First,let's create simple list # print "Create a simple list" simpleList = ["Karmic","Lucid","Hardy","Jaunty","Intrepid"] # print it print simpleList # # Interrogate the list # print "nInterrogate the list" # get item 3: lists start counting at 0 so it should be Jaunty print simpleList[3] # we can also get a slice print simpleList[2:4] # get the first three items print simpleList[:3] # or all items from number index 3 (which is the fourth item) to the end print simpleList[3:] # we can also take every other item,as a slice is defined # like this: start:stop:step print simpleList[::2] # get the length of the list print len(simpleList) # we can get the index of an item in the list print simpleList.index("Hardy") # and when the list doesn't contain the item,we get an error that we can catch try: print simpleList.index("Feisty") except ValueError: print "The list doesn't contain the item Feisty" # # Modify the list # print "nModify the list" # add another item simpleList.append("Twisty") print simpleList # oops! let's sort this out by replacing in place simpleList[5] = "Gutsy" print simpleList # extend the list with another one otherList = ["Edgy","Breezy"] simpleList.extend(otherList) print simpleList # remove an item from the list (Hardy should not be in the list anymore) del simpleList[2] print simpleList # insert an item in the middle of the list simpleList.insert(4,"Hardy") print simpleList # remove an item by its value rather than its index simpleList.remove("Edgy") print simpleList # # Create modified copies of the list # print "nCreate modified copies of the list" # sort it print sorted(simpleList) # join it to produce a custom print print ' => '.join(sorted(simpleList)) # lists can contain the same item several times so if we add Lucid again: simpleList.append("Lucid") # we have it twice in the list (easier to see if we sort it) print sorted(simpleList) # but we can get round that by transforming it into a set,which is a list # with no duplicates; and of course we can also sort the set print sorted(set(simpleList)) # # Iterate over the list # print "nIterate over the list" for i in simpleList: print i.upper() # but if we want to create another list by applying the same expression to # each item,we can use a list comprehension upList = [i.upper() for i in sorted(set(simpleList))] print upList 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |