conditional-statements

问题 How can you create a function or component etc that will stop all running code until a condition is met? For example the same way as a JOptionPane will do, if I have this for example: JOptionPane.showInputDialog(null, "Hello", "Title", 1); Within a function etc and then print to the console afterwards it it will not print until I close the JOptionPane. I am guessing this component has some sort of thread setup built in to do this but how could I duplicate that with my own functions? So say

问题 How can you create a function or component etc that will stop all running code until a condition is met? For example the same way as a JOptionPane will do, if I have this for example: JOptionPane.showInputDialog(null, "Hello", "Title", 1); Within a function etc and then print to the console afterwards it it will not print until I close the JOptionPane. I am guessing this component has some sort of thread setup built in to do this but how could I duplicate that with my own functions? So say

问题 I have a list which has dataframes of various dimensions. I want to extract those dataframes who rows greater than 30 I tried : DR<-sapply(list, function(x) subset(list,nrow(list$'x')=30)) But it is showing error. Please help! 回答1: Assuming your list is called list_df , we can use Filter Filter(function(x) nrow(x) == 30, list_df) Or sapply list_df[sapply(list_df, nrow) == 30] We can also use purrr::keep purrr::keep(list_df, ~nrow(.) == 30) 来源： https://stackoverflow.com/questions/58850863/how

问题 I have KOHANA_ENV environment var set to DEVELOPMENT for example. Now there is a set of rules I'd like to apply only if that var is set to PRODUCTION (turn on mod_deflate, set expires headers defaults, turn off ETags, etc.), like: if (KOHANA_ENV == PRODUCTION) { // .. do stuff } Is there a way to do this on Apache level at all or it's better to have two conf files? 回答1: I do it with the help of the great module mod_macro. Let's say you have in /etc/apache2/envvars (for a Debian-like

问题 I'm writing a python program that takes a given sentence in plan English and extracts some commands from it. It's very simple right now, but I was getting some unexpected results from my command parser. After looking into it a bit, it seems my condition-logic wasn't evaluating as I intended it to. This is a really inelegant way to do it of course, and way too verbose. I'm going to be entirely restructuring it, using possibly neural networks or regular expressions or a combination of them. But

问题 I'd like to change the way elements are rendered depending on the page's backend layout. Changing the fluid styled content template depending on the backend layout works as following: [globalVar = TSFE:page|backend_layout = 1][globalVar = TSFE:page|backend_layout = 2] lib.fluidContent.templateRootPaths.10 = EXT:ds_res/Resources/Private/Templates/ContentTemplates/ [global] If it's 1 or 2, then use the other templates. However , this only works if the BE layout is set directly at the page and

问题 For a time series dataset: A, How do I find the local minima (nadir values) for each ID? (local mins) B, How do I find any subsequent values that are 2 greater than each local minima. (local mins + 2) import pandas as pd df = pd.DataFrame({'id': [1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2], 'value': [8,5,3,2,1,2,3,5, 1.5, 3, 1, 1.5, 2, 3, 4, 0.4]}) For A, I was able to use the following code to find all the nadir/local minimum values from the dataset, but they are not grouped by each id. How do I modify

问题 Once again, I apologize for asking this type of question, but the R world is so large that sometime I feel lost, even if I have read some of the best book related with R. I have the following DB ID=rep((1:3),3) x<-as.Date("2013-1-1") y<-as.Date("2013-1-2") z<-as.Date("2013-1-3") DATE<-c(x,x,x,y,x,y,z,z,z) TRAP<-c(1,1,1,3,2,3,2,1,3) IN<-data.frame(ID,DATE,TRAP) and I would like to produce a binary variable (RESULT) according to the following conditions: if the DATE and the TRAP is the same for

问题 I need to URLs with three specific specific substrings out of a loop. The following code worked, but I am sure there's a more elegant way to do it: for node in soup.findAll('loc'): url = node.text.encode("utf-8") if "/store/" not in url and "/cell-phones/" not in url and "/accessories/" not in url: objlist.loc.append(url) else: continue Thank you! 回答1: url = node.text.encode("utf-8") sub_strings = ['/store','/cell-phones/','accessories'] if not any(x in url for x in sub_strings): objlist.loc

问题 I need to URLs with three specific specific substrings out of a loop. The following code worked, but I am sure there's a more elegant way to do it: for node in soup.findAll('loc'): url = node.text.encode("utf-8") if "/store/" not in url and "/cell-phones/" not in url and "/accessories/" not in url: objlist.loc.append(url) else: continue Thank you! 回答1: url = node.text.encode("utf-8") sub_strings = ['/store','/cell-phones/','accessories'] if not any(x in url for x in sub_strings): objlist.loc