Advertisements So hello everybody. I recently had a problem which I tried to use python included file functions and stuff i tried making a text editor which was when i encountered a problem i tried to make the txteditor like this: one = input() two = input() three = input() four = input() five =… Read More Having problems while creating a text editor using python
Advertisements For a multilingual website I want to detect existence of region code (fr, en, es, etc) inside url. The goal is to add region code for each url that doesn’t have yet one , for example : https://subdomain.domain.com/fr. To do I use wp_safe_redirect() function and this condition which works: if(preg_match ("/^(?:(?!fr).)*$/i", $_SERVER[‘REQUEST_URI’])){ wp_safe_redirect($addlang.’/’.$currentpage); }… Read More php: What good syntax for integrating a variable into regex
Advertisements It’s a simple question. We have the await keyword which allows the function execution to return a result before continuing. Of course you can use promises in the same way, but I’m specifically interested in async in this question. An async function would appear in the following context. const funcA = async newValue =>… Read More Syntax question: Why is it necessary to define a function as async in JS?
Advertisements I don’t understand why I can’t use numpy. after I give it an alias. I got an error for this. import numpy as np ar = numpy.array([1,2,3,4,5]) print(ar) I can only type import numpy as np ar = np.array([1,2,3,4,5]) print(ar) >Solution : That is just how the import … as statement behaves. You choose… Read More Python 'as' keyword
Advertisements I am learning C++ for the first time, and I’m going through "Understanding the C++ Programming Language, Fourth Edition, C++11". I’m having trouble getting some code to compile from an early section. I’m creating a custom Vector class with some basic functionality using the code below: #include <iostream> class Vector { public: Vector(int s)… Read More Constructor Definition in C++
Advertisements Explain this line of Rust code (what is +?): pub struct BlinkAlloc<A: Allocator = +Global> { >Solution : I think you are looking at this: pub struct BlinkAlloc<A: Allocator = +Global> { arena: ArenaLocal, allocator: A, } This is not valid Rust syntax… usually. But this struct definition is actually inside a macro call.… Read More What is this + (plus) in trait bounds?
Advertisements So in Kotlin you can write the below function in two ways: fun getProduct(id: Int): Product? { if (id < 1 ) return null return productProvider.getProduct(id) /// Assuming getProduct NEVER fails } Or as below: fun getProduct(id: Int) = if (id > 0 ){ productProvider.getProduct(id) /// Assuming getProduct NEVER fails }else { null }… Read More Correct usage of return if in Kotlin
Advertisements I’m learning python. It gives syntax error in this script. I’m unable to figure out. conn = psycopg2.connect( host = str(Ip) user = "test" password="test1234") the error: user^= "test" ^ SyntaxError: invalid syntax There is something wrong with the user variable instantiation according to the compiler.. I have no knowledge of how to solve… Read More why does variable instantation contain syntax error?
Advertisements I try to figure out why the following command fails docker run \ –rm \ –name somedb \ -v "$(pwd)/database:/var/lib/mysql/" \ -p "3306:3306" \ -e MARIADB_USER=dbuser \ -e MARIADB_PASSWORD=dbuserpwd \ -e MARIADB_ROOT_PASSWORD=rootpwd \ -d \ mariadb:10.10-jammy with the message: docker: invalid reference format. See ‘docker run –help’. -e : commande introuvable ## command could not… Read More multi-line command line in bash fails while equal one line command line succeeds
Advertisements I am trying to write a program in C that takes a positive integer that is input and then counts down to zero and back up to the number by 1. I am getting errors when trying to run the code saying that my variables usernum and usernum2 are undeclared. In the main function… Read More How do I properly declare this variable?