error-handling

问题 According to This Github File, I was trying to create a hover for an action button in python 3.7.5 windows 10 platform. This is what i tried: from kivy.app import App from kivy.uix.widget import Widget from kivy.base import runTouchApp from kivy.lang import Builder from kivy.uix.label import Label from kivy.core.window import Window from kivy.uix.floatlayout import FloatLayout from kivy.uix.actionbar import * from kivy.properties import ObjectProperty from kivy.properties import

问题 This question already has answers here : Try/catch does not seem to have an effect (7 answers) Closed 2 months ago . I am trying to handle setting a PowerShell variable from a registry key. So I use a try{} catch {} to get rid of eventual errors in case the key doesn't exists. However, I still get the error output on console. $ZZ_ConVTL = try { (Get-ItemProperty -path "HKCU:\Console" -name VirtualTerminalLevel).VirtualTerminalLevel } catch { "N/A" } ... # Output: Get-ItemProperty : Property

问题 My question is similar to this one, but the latter did not receive an answer I can work with. I am scraping thousands of urls with xml2::read_html . This works fine. But when I try and parse the resulting html documents using purrr::map_df and html_nodes , I get the following error: Error in doc_namespaces(doc) : external pointer is not valid For some reason, I am unable to reproduce the error using examples. The example below is not good, because it works totally fine. But if someone could

问题 I'm trying to create a user-interface for a personal assistant. I want the user to input a text and when he presses enter,i want to do something(' say print a text') and also automatically clear the input field. This is my code: from kivy.app import App from kivy.uix.widget import Widget from kivy.lang import Builder from kivy.core.window import Window from kivy.uix.floatlayout import FloatLayout from kivy.properties import ObjectProperty from kivy.uix.textinput import TextInput from kivy.uix

问题 Why isn't Result<()> allowed when compiling this bit of Rust code? Is it a breaking change between Rust editions? fn run() -> Result<()> { let (tx, rx) = channel(); thread::spawn(move || { do_things_with_tx(&exit_tx); }); match exit_rx.recv() { Ok(result) => if let Err(reason) = result { return Err(reason); }, Err(e) => { return Err(e.into()); }, } Ok(()) } The compiler says: error[E0107]: wrong number of type arguments: expected 2, found 1 --> src/main.rs:1000:18 | 1000 | fn run_wifi() ->

问题 Why isn't Result<()> allowed when compiling this bit of Rust code? Is it a breaking change between Rust editions? fn run() -> Result<()> { let (tx, rx) = channel(); thread::spawn(move || { do_things_with_tx(&exit_tx); }); match exit_rx.recv() { Ok(result) => if let Err(reason) = result { return Err(reason); }, Err(e) => { return Err(e.into()); }, } Ok(()) } The compiler says: error[E0107]: wrong number of type arguments: expected 2, found 1 --> src/main.rs:1000:18 | 1000 | fn run_wifi() ->

问题 Why isn't Result<()> allowed when compiling this bit of Rust code? Is it a breaking change between Rust editions? fn run() -> Result<()> { let (tx, rx) = channel(); thread::spawn(move || { do_things_with_tx(&exit_tx); }); match exit_rx.recv() { Ok(result) => if let Err(reason) = result { return Err(reason); }, Err(e) => { return Err(e.into()); }, } Ok(()) } The compiler says: error[E0107]: wrong number of type arguments: expected 2, found 1 --> src/main.rs:1000:18 | 1000 | fn run_wifi() ->

问题 My Swift program is crashing with EXC_BAD_INSTRUCTION and one of the following similar errors. What does this error mean, and how do I fix it? Fatal error: Unexpectedly found nil while unwrapping an Optional value or Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value This post is intended to collect answers to "unexpectedly found nil" issues, so that they are not scattered and hard to find. Feel free to add your own answer or edit the existing wiki answer. 回答1:

问题 I have a global Errorhandler in which I process Client- and Server-Errors. To provide a feedback for the user I want to open a modal which returns the error-message. Therefore I've implemented a modal: import {Component} from '@angular/core'; import {BsModalRef, BsModalService} from 'ngx-bootstrap'; import {Button} from '../../layout-models/button.model'; @Component({ selector: 'error-modal', templateUrl: './error-modal.component.html', styleUrls: ['./error-modal.component.scss'] }) export

问题 I have a .bat (Windows command) file that includes invocations of SQLCMD and other commands. (Of course SQLCMD is sending my T-SQL code to SQL Server.) I want to detect certain conditions in the SQL code, and conditionally exit the entire batch file. I've tried various combinations of RAISERROR, THROW, and deliberate division by 0 (I'm not proud) along with various command line switches on SQLCMD and handling of errorlevel in the .bat file. I tried the answer to 5789568 but could not get it