appending list but error 'NoneType' object has no attribute 'append'
I have a script in which I am extracting value for every user and adding that in a list but I am getting "'NoneType' object has no attribute 'append'". My code is like ``` last_list=[] if p.last_nam...
Is there an operator to calculate percentage in Python?
I've recently learned that the " % " sign is used to calculate the remainder of an integer in Python. However I was unable to determine if there's another operator or method to calculate percent in Py...
- Modified
- 31 Jul at 00:41
What is useState() in React?
I am currently learning hooks concept in React and trying to understand below example. ``` import { useState } from 'react'; function Example() { // Declare a new state variable, which we'll call...
- Modified
- 17 Sep at 21:15
How to automatically start a service when running a docker container?
I have a [Dockerfile](https://github.com/larazest/db/blob/master/Dockerfile) to install MySQL server in a container, which I then start like this: ``` sudo docker run -t -i 09d18b9a12be /bin/bash ```...
- Modified
- 5 Aug at 09:53
How do I set the colour of a label (coloured text) in Java?
How do I set the color of the text of a label? ``` myLabel.setText("Text Color: Red"); myLabel.??? ``` Can I have two seperate colors in one label? For example here: The `"Text Color:"` to be bla...
TypeScript: Property does not exist on type '{}'
I am using Visual Studio 2013 fully patched. I am trying to use JQuery, JQueryUI and JSRender. I am also trying to use TypeScript. In the ts file I'm getting an error as follows: > Property 'fadeDiv'...
- Modified
- 31 Jul at 09:33
How to rename files and folder in Amazon S3?
Is there any function to rename files and folders in Amazon S3? Any related suggestions are also welcome.
- Modified
- 5 Jun at 12:7
ORA-28000: the account is locked error getting frequently
I am facing this error given below : ``` ORA-28000: the account is locked ``` Is this a DB Issue ? Whenever I unlock the user account using the alter SQL query, that is `ALTER USER username ACCOUNT U...
Remove directory from remote repository after adding them to .gitignore
I committed and pushed some directory to github. After that, I altered the `.gitignore` file adding a directory that should be ignored. Everything works fine, but the (now ignored) directory stays on ...
How to convert Integer to int?
I am working on a web application in which data will be transfer between client & server side. I already know that JavaScript int != Java int. Because, Java int cannot be null, right. Now this is t...
Why have header files and .cpp files?
Why does C++ have header files and .cpp files?
- Modified
- 28 May at 16:58
Can we have functions inside functions in C++?
I mean something like: ``` int main() { void a() { // code } a(); return 0; } ```
- Modified
- 19 Mar at 02:58
What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
When should certain image file types be used when building websites or interfaces, etc? What are their points of strength and weakness? I know that PNG & GIF are lossless, while JPEG is lossy. But w...
How to validate an XML file against an XSD file?
I'm generating some xml files that needs to conform to an xsd file that was given to me. How should I verify they conform?
- Modified
- 9 Feb at 14:4
How do I fill arrays in Java?
I know how to do it normally, but I could swear that you could fill out out like a[0] = {0,0,0,0}; How do you do it that way? I did try Google, but I didn't get anything helpful.
How to check for changes on remote (origin) Git repository
What are the Git commands to do the following workflow? I cloned from a repository and did some commits of my own to my local repository. In the meantime, my colleagues made commits to the remote rep...
- Modified
- 25 Oct at 04:22
Loop through the rows of a particular DataTable
IDE : VS 2008, Platform : .NET 3.5, Hi, Here is my DataTable columns : ID Note Detail I want to write sth like this : ``` //below code block is not the right syntax For each q in dtDataTable.Co...
React Native: How to select the next TextInput after pressing the "next" keyboard button?
I defined two TextInput fields as follows: ``` <TextInput style = {styles.titleInput} returnKeyType = {"next"} autoFocus = {true} placeholder = "Title" /> <TextInput style = {styles.d...
- Modified
- 23 Sep at 20:17
Powershell Invoke-WebRequest Fails with SSL/TLS Secure Channel
I'm trying to execute this powershell command `Invoke-WebRequest -Uri https://apod.nasa.gov/apod/` and I get this error. https requests appear to work ("[https://google.com](https://google.com)") ...
- Modified
- 30 Nov at 04:51
maximum value of int
Is there any code to find the maximum value of integer (accordingly to the compiler) in C/C++ like `Integer.MaxValue` function in java?
- Modified
- 26 Nov at 15:13
UnsupportedTemporalTypeException when formatting Instant to String
I'm trying to format an Instant to a String using the new Java 8 Date and Time API and the following pattern: ``` Instant instant = ...; String out = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")...
- Modified
- 6 Feb at 21:17
Get ConnectionString from appsettings.json instead of being hardcoded in .NET Core 2.0 App
I have the following class in NET Core2.0 App. ``` // required when local database does not exist or was deleted public class ToDoContextFactory : IDesignTimeDbContextFactory<AppContext> { public...
- Modified
- 21 Apr at 09:8
How to add column to numpy array
I am trying to add one column to the array created from `recfromcsv`. In this case it's an array: `[210,8]` (rows, cols). I want to add a ninth column. Empty or with zeroes doesn't matter. ``` from ...
Parse String to Date with Different Format in Java
I want to convert `String` to `Date` in different formats. For example, I am getting from user, ``` String fromDate = "19/05/2009"; // i.e. (dd/MM/yyyy) format ``` I want to convert this `fromDa...
I am getting an "Invalid Host header" message when connecting to webpack-dev-server remotely
I am using as an environment, a Cloud9.io ubuntu VM Online IDE and I have reduced by troubleshooting this error to just running the app with Webpack dev server. I launch it with: ``` webpack-dev-se...
- Modified
- 29 Sep at 11:40