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问题 I'm scraping and having trouble getting the element of the “th” tag that comes before the other “th” element that contains the “type2” class. I prefer to take it by identifying that it is the element "th" before the "th" with class "type2" because my HTML has a lot of "th" and that was the only difference I found between the tables. Using rvest or xml2 (or other R package), can I get this parent? The content which I want is "text_that_I_want". Thank you! <tr> <th class="array">text_that_I

问题 I am seeking a way to prevent multi form submit. I have a form, for example chat.php and its POST action on different file, eg submitter.php. I've tried to implement the solution with the unique token using $_SESSION. chat had a unique $_SESSION[token] and submitter had the if $_POST[token]==$_SESSION[token] My problem is that it didn't work if I had multiple windows opened. Guess the application is a chat script where users can chat on multiple windows, like chat.php?user=5, chat.php?user=10

问题 This question already has answers here : QtDesigner changes will be lost after redesign User Interface (2 answers) Closed 10 months ago . i have created a ui file, window.ui (consist with a tab widget) and a Widget file student (some buttons,functions) using qtDesigner and than convert into py file using pyuic5. and inherit in a separate file like mainWindow.py and mainStudent.py . i added a tabWidget into mainWindow.py and i want to call the page student.py from the tab . so i create a new

问题 a newbie in JAX-REST (jersey 1.8 impl) I have a class for Resource "/hello" package com.lbs.rest; import javax.ws.rs.Consumes; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; @Path("/hello") public class Test { //-- produces MIME type text/plain @GET @Produces(MediaType.TEXT_PLAIN) public String thankYouTxt(){ System.out.println("thankYouTxt"); return "thankYouTxt\n"; } //-- consumes MIME type text/plain @GET @Consumes(MediaType

问题 I have a requirement that background service should run Process method every day at 0:00 a.m. So, one of my team member wrote the following code: public class MyBackgroundService : IHostedService, IDisposable { private readonly ILogger _logger; private Timer _timer; public MyBackgroundService(ILogger<MyBackgroundService> logger) { _logger = logger; } public void Dispose() { _timer?.Dispose(); } public Task StartAsync(CancellationToken cancellationToken) { TimeSpan interval = TimeSpan

问题 I save my file to the SharePoint folder(onedrive sync) using the following VBA code. Off late for some reasons not known to me the SharePoint properties are not displayed ActiveWorkbook.SaveAs fileName:=spath & e wherein spath is the SharePoint path and e is the filename. However, if a file is saved manually to the same folder then the properties appear. any help is appreciated For better understanding here is a screenshot of my query 回答1: If you cannot save the file directly to SharePoint,

问题 I'm scraping and having trouble getting the element of the “th” tag that comes before the other “th” element that contains the “type2” class. I prefer to take it by identifying that it is the element "th" before the "th" with class "type2" because my HTML has a lot of "th" and that was the only difference I found between the tables. Using rvest or xml2 (or other R package), can I get this parent? The content which I want is "text_that_I_want". Thank you! <tr> <th class="array">text_that_I

问题 I am stuck at this problem. I think it is equivalent to show 2m choose m is big theta of 4 to the power n, but still find difficult to prove it. Thanks of @LutzL's suggestion. I thought of stirling's approximation before. 回答1: The O -part should be easy. Choosing exactly n /2 elements out of n is a special case of choosing arbitrary combinations out of n elements, i.e. deciding for each of these n elements whether to choose it or not. The Ω -part is harder. In fact, plotting 4n / binomial(2 n

问题 I have an excel sheet where I have a table with two columns and variable number of rows. Some of these rows will be filled and some empty. Column B contains some values and Column A has a drop down list in each cell. I want that if column B cell has some value then the adjacent column A cell should show 3 options in the drop down list - MODIFY, ADD, DELETE and when column B cell is empty then the adjacent column A cell should show only one option in its drop down list - ADD. Can it be done

问题 There's a workaround to allow access the index inside a s/lapply e.g. x <- list(a=11,b=12,c=13) lapply(seq_along(x), function(y, n, i) { paste(n[[i]], y[[i]]) }, y=x, n=names(x)) Is there any function like s/lapply (or like purrr::map() ) which allows access to the index in the simplest way possible, which I guess would be to simply supply its desired name to the initial function call and nothing more; map_with_index <- function(.x, .f, index) { # Same as purrr::map() # ..but whatever string