python valueerror : too many values to unpack

I am a python beginner . I was trying to run this code :

def main():
print ( " This program computes the average of two exam scores . ")
score1,score2 = input ("Enter two scores separated by a comma:")
average = (score1 + score2)/2.0
print ("The average of the score is : " , average )




when I summon the main() I got this ValueError :

ValueError: too many values to unpack (expected 2)




what is wrong with this code ?

Read More

storing std::reference_wrapper into std::set

I was hoping infer std::reference_wrapper to MyType& automagically on bool operator

Read More

Dijkstra’s Algorithm negative edges

How can I formally prove that Dijkstra’s algorithm doesn’t work with negative-weighted edges?

Read More

expo DocumentPicker is not selecting any document

I am new to React native i have a problem withe the expo DocumentPicker for some reason the DocumentPicker does not select any file, and it always shows that Selected Document: None

import React, { useState } from "react";
import { Button, StyleSheet, Text, View } from "react-native";
import * as DocumentPicker from "expo-document-picker";

export default function App() {
const [document, setDocument] = useState(null);

const pickDocument = async () => {
const result = await DocumentPicker.getDocumentAsync({ type: 'application/pdf' });
if (result.type === "success") {
setDocument(result);
}
};

return (


Selected Document: {document ? document.name : "None"}



);
}

const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: "center",
justifyContent: "center",
padding: 20,
},
paragraph: {
marginTop: 24,
fontSize: 18,
fontWeight: "bold",
textAlign: "center",
},
});

Read More

How to get the json object with Typescript?

I am trying to get job by job_id via firebase rest api. I am getting this JSON result below. How i can rid of the 0 and get the object?


And Is there better way to get the job via firebase rest api?
This is my code:
{
"0": {
"category_id": 0,
"created_on": "Mar 29, 2024",
"description": "Dolor justo tempor duo ipsum accusam rebum gubergren erat. Elitr stet dolor vero clita labore gubergren. Kasd sed ipsum elitr clita rebum ut sea diam tempor. Sadipscing nonumy vero labore invidunt dolor sed, eirmod dolore amet aliquyam consetetur lorem, amet elitr clita et sed consetetur dolore accusam.",
"job_id": "TEL5UAVd5b3Q4jLY2aFfWs4QneMO",
"job_nature": "Full-time",
"location": "Gabrovo, Bulgaria",
"qualifications": [
"Rebum vero dolores dolores elitr",
"Elitr stet dolor vero clita labore gubergren",
"Dolor justo tempor duo ipsum accusam"
],
"salary": "$1500-$1900",
"title": "Marketing manager",
"user_id": "qDDuvTWL00N2sNXPhMy2rE0ZB8w2"
}
}

export class JobDetailComponent implements OnInit {
job = {} as Job;

constructor(
private apiService: ApiService,
private activeRoute: ActivatedRoute
) { }

ngOnInit(): void {
this.activeRoute.params.subscribe((data) => {
const id = data['jobId'];

this.apiService.getJob(id).subscribe((job) => {
this.job = job;
console.log(job)
});
});
}
}

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { environment } from 'src/environments/environment.development';
import { Category } from './types/category';
import { Job } from './types/job';

@Injectable({
providedIn: 'root'
})
export class ApiService {
constructor(private http: HttpClient) { }

getCategories() {
const { apiUrl } = environment;
return this.http.get(`${apiUrl}/categories.json`);
}
getJobs() {
const { apiUrl } = environment;
return this.http.get(`${apiUrl}/jobs.json`);
}
getJob(id: string) {
const { apiUrl } = environment;
return this.http.get(`${apiUrl}/jobs.json?orderBy="job_id"&equalTo="${id}"`);
}
}

Read More

Boost Your Laravel Forge Productivity 🚀

submitted by /u/christophrumpel
[link] [comments]

Read More

Suppress default message of assert_eq! when custom message provided?

To my surprise, when I supply a custom message, it seems that assert_eq!'s default message is also printed out regardless.


Here I'm comparing some very long strs. So it is preferable not to clutter up the console but instead take a limited slice of each.
let left = tds.get_bulk_post_str();
let error_msg = format!("Bulk text is not what is expected: get_bulk_post_str() starts\n{}...\n\nExpected text starts\n{}...\n",
&left[0..20], &expected_bulk_text[0..20]);
// assert_eq! not used because assert_eq! apparently does not suppress its default message even when you supply a custom message!
// ... and in this case the default message is far too long.
// assert_eq!(left, expected_bulk_text, "{}", error_msg);

// instead, I think I'm forced to do something like this:
if left != expected_bulk_text {
panic!("{}", error_msg)
}



... is there any way of suppressing the default message?


If not, this seems a strange design choice, unlike any other language I know. Is it deliberate?


PS I'm aware the first 20 chars of each string might be identical. Obviously if I really wanted to go to town on this I'd have to examine both strings to find out the first case of difference, and just print corresponding slices from the middle.

Read More

Bidimensional splines, strictly increasing in one argument

I am working in R. I want to specify flexibly a function q(X,Y) where q is strictly increasing with respect to X (but not necessarily with respect to Y).
I want to use bidimensional splines but I don't know how to do (how to impose the monotonicity constraint in 2D).
So far, my method is to select several values of Y, and for each values of Y, I compute a monotone splines with respect to X. And then I interpolate to create the whole function q. But I wonder if it was possible to do all this in 1 step?

Read More

firebase_storage/object-not-found. No object exists at the desired reference

I am trying to fetch images from firebase storage and display it in my flutter app but i am getting the error "No object exists at the desired reference". All the images are stored in the root directory. I have also changed the firebase rules to allow read and write without authentication.
This is my code.
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:firebase_storage/firebase_storage.dart';

void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Wallpaper App',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: WallpaperScreen(),
);
}
}

class WallpaperScreen extends StatefulWidget {
@override
_WallpaperScreenState createState() => _WallpaperScreenState();
}

class _WallpaperScreenState extends State {
List imageUrls = []; // Store fetched image URLs

@override
void initState() {
super.initState();
fetchImages();
}

Future fetchImages() async {
try {
final storageRef = FirebaseStorage.instance.ref();
final result = await storageRef.listAll();

for (var item in result.items) {
try {
final url = await item.getDownloadURL();
setState(() {
imageUrls.add(url);
});
} catch (error) {
print("Error fetching URL");
}
}
} catch (e) {
print("Error fetching images: $e");
}
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Wallpapers'),
),
body: GridView.builder(
itemCount: imageUrls.length,
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
crossAxisSpacing: 4.0,
mainAxisSpacing: 4.0,
),
itemBuilder: (BuildContext context, int index) {
return Image.network(
imageUrls[index], // Load image from URL
fit: BoxFit.cover,
);
},
),
);
}
}

Read More

Use Font Awesome icon as CSS content

I want to use a Font Awesome icon as CSS content, i.e.,

a:before {
content: "...";
}




I know I cannot use HTML code in content, so is it only images left?

Read More