extract

问题 I am pretty new to R. I scraped a website that required login yesterday, the page is xml format like below. <result status="success"> <code>1</code> <note>success</note> <teacherList> <teacher id="D95"> <name>Mary</name> <department id="420"> <name>Math</name> </department> <department id="421"> <name>Statistics</name> </department> </teacher> <teacher id="D73"> <name>Adam</name> <department id="412"> <name>English</name> </department> </teacher> </teacherList> </result> Recently I just

问题 I'm trying to extract the last string between two "/" for example: for this string: https://stackoverflow.com/questions/ask I want to return "questions" However, for this string Extract the last substring from a cell I want to return "6133287" It has to always be the string in between the last two "/" I was working with some MID functions I found in this forum, but they were working for things at the beginning of the string. Not necessarily for strings with different lengths. Thanks, J 回答1: C

问题 I have written a perfectly working XML parser using PHP... using, $xml = simplexml_load_file($newfile); Now, The newfile was a pointer to an xml file that has over 20000 lines. The problem was, the system ( an android) started generating tags called < none > ... when no value existed... BUT, there is NO < /none > tag ... There are multiple < none > values !! It seems like a) Either instruct Android not to do this ! - TRIED, but it can't be controlled .. OS deals with it. b) or, Create a PHP

问题 How would you "extract" nested try/finally blocks from a routine into a reusable entity? Say I have procedure DoSomething; var Resource1: TSomeKindOfHandleOrReference1; Resource2: TSomeKindOfHandleOrReference2; Resource3: TSomeKindOfHandleOrReference3; begin AcquireResource1; try AcquireResource2; try AcquireResource3; try // Use the resources finally ReleaseResource3; end; finally ReleaseResource2; end; finally ReleaseResource1; end; end; and want something like TDoSomething = record // or

问题 I built a macro to extract certain columns from a closed workbook and paste them in a worksheet. That sheet is then used to create pivot tables and futher used with vlookup functions. The only problem I have is filters. There are 2 users of the data that are assigned different variables in a filter. Adding to that, the variables in the filter can change. Although the users need the same filters, some of the filters assigned to the user may be not be present in all the files they are

问题 I have a little problem when I'm trying to extract a file using Libtar. This is my code: int htlp_decompress_decompress(char * filename) { TAR * tar_file; char rootdir[200]; strcpy(rootdir, "/var/cache/htpackage/"); if (tar_open(&tar_file, filename, NULL, O_RDONLY, 0, TAR_GNU) == -1) { fprintf(stderr, "tar_open(): %s\n", strerror(errno)); return -1; } if (tar_extract_all(tar_file, rootdir) != 0) { fprintf(stderr, "tar_extract_all(): %s\n", strerror(errno)); return -1; } if (tar_close(tar_file

问题 here is my spider from scrapy.spider import BaseSpider from scrapy.selector import Selector from sample1.items import ppppkartItem class ppppkartSpider(BaseSpider): name = "ppppkart" allowed_domains = ["ppppkart.com"] start_urls = ["http://www.ppppkart.com/mobilesotracker=nmenu_sub_electronics_0_Mobiles"] def parse(self, xmlresponse): sel = Selector(xmlresponse) sites = sel.xpath('//html/body/div/div[2]/div/div[2]/div[2]/div/div[2]') items = [] for site in sites: item = ppppkartItem() item[

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I am trying to use python to rename a filename which contains values such as: ~test1~test2~filename.csv I want to rename the file to filename.csv. The tildes being my separator for the first two words, and I do

问题 A question regarding a parser. Is there any chance to catch some separators within the that separate the table... The paser script runs allready nicely. Note - i want to store the data into a MySQL database. So it would be great to have some seperators - (commas, tabs or somewhat else - a tab seperated values or comma seperated values are handy formats to work with... ( here the data out of the following site: http://192.68.214.70/km/asps/schulsuche.asp?q=a&a=20 ) lfd. Nr. Schul- nummer

问题 I'm making my first laravel project, using postgres, and I'd like to be able to access all the people with a birthday this month (my people table has a birthdate field that's a date). I can use extract to get these records from the database, like so: select * from people where extract (month from birthdate) = 11; But when I try a few different ways in my controller I get 'unknown column' errors: $birthday_people = DB::table('people') ->where ("extract(month from birthdate)", "=", "11") ->get(