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Questions and answers begin here Latest Questions

Asked: 5 years agoIn: Programming

MongoError: connect ECONNREFUSED 127.0.0.1:27017 (Solved)

teddybear5150 Teacher

I’ve been working on a website that interacts with a MongoDB database, but I keep running into an error when trying to connect to the MongoDB instance. The error message reads: “MongoError: connect ECONNREFUSED 127.0.0.1:27017”. This happens whenever I try ...Read more

I’ve been working on a website that interacts with a MongoDB database, but I keep running into an error when trying to connect to the MongoDB instance. The error message reads: “MongoError: connect ECONNREFUSED 127.0.0.1:27017”. This happens whenever I try to run my Node.js application.
Here’s my code:

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/myDatabase', {useNewUrlParser: true});
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
console.log("Connected successfully.");
});

I have already checked that MongoDB is running on the default port (27017). I have also tried using the IP address 0.0.0.0 instead of localhost, but that didn’t work either. What could be causing this error and how can I fix it? Any help would be greatly appreciated.

Read less
connectionerrorlocalhostmongodbNode.js
  1. scytheria.nel Teacher
    Added an answer about 5 years ago

    It seems like you are facing an issue with connecting to the MongoDB database. There could be several reasons for this error, but one common possibility is that the MongoDB server is not running. To resolve this issue, you can start by checking if the MongoDB service is running. You can do this by rRead more

    It seems like you are facing an issue with connecting to the MongoDB database. There could be several reasons for this error, but one common possibility is that the MongoDB server is not running.

    To resolve this issue, you can start by checking if the MongoDB service is running. You can do this by running the following command in your terminal or command prompt:

    “`sudo service mongod status“`

    If the service is not running, you can start it by running the following command:

    “`sudo service mongod start“`

    If the service is already running, you can try restarting it and then attempting to connect to the MongoDB database again.

    Another reason for this error could be a mismatch between the port number specified in your connection string and the actual port number on which the MongoDB server is running. Make sure that you have specified the correct port number in your connection string.

    I hope this helps you resolve the issue. Let me know if you have any other questions or if this solution does not work for you.

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Asked: 6 years agoIn: Programming

Python String Class like StringBuilder in C#

fabian_mgram Begginer

I have been trying to build a Python application that can generate a text file consisting of multiple lines of text, and I was wondering if there is any way to do this without having to create a new string ...Read more

I have been trying to build a Python application that can generate a text file consisting of multiple lines of text, and I was wondering if there is any way to do this without having to create a new string object every time I want to add a line of text to the file. I stumbled upon the Python String class, and someone suggested on a forum post that I should use the StringBuilder class from C# to make my code more efficient.
However, I am not quite sure how to use the StringBuilder class in Python or if there is an equivalent class that I can use. I have tried using the io package to create a file and adding text to it, but it seems to be very slow when it comes to adding many lines of text. For example, when I tried to add 100,000 lines of text to the file, it took almost a minute to complete.
Is there a more efficient way to generate a large text file in Python? Can I use the StringBuilder class from C# in Python somehow, or is there another built-in class that I can use to make writing to a file more efficient? Any help or suggestions would be greatly appreciated.

Read less
c#classpythonstring-manipulationstringbuilder
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

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Asked: 5 years agoIn: Programming

How to disable ‘Unexpected console statement’ in Node.js with ESLint

jimyung.lee

I’m a newbie on Node.js and I need some help with my code. I’m currently using ESLint and I keep getting an error message saying “no-console.” I have some console.log statements in my code that I need to keep for ...Read more

I’m a newbie on Node.js and I need some help with my code. I’m currently using ESLint and I keep getting an error message saying “no-console.” I have some console.log statements in my code that I need to keep for debugging purposes, but I want to disable this rule just for this specific file. I read the documentation and tried using different configurations, but it doesn’t seem to work. Here’s a sample of my code:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;
app.get('/', (req, res) => {
console.log('Request received');
res.send('Hello World!');
});
app.listen(PORT, () => {
console.log(`Server listening on port ${PORT}`);
});

I tried adding the following at the top of my file:

/* eslint-disable no-console */

And also tried creating an .eslintrc.json file with the following contents:

{
"rules": {
"no-console": "off"
}
}

Unfortunately, I still get the same error message. What am I doing wrong? I really need those console.log statements for debugging purposes but I don’t want to ignore all ESLint rules. Are there any other configurations or workarounds that I can use to keep this rule disabled just for this specific file? Thanks in advance for your help!

Read less
consoledebuggingeslintNode.jssyntax errors
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

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    • 30
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Asked: 6 years agoIn: Programming

How to fix “missing dependency” warning when using useEffect React hook.

_the.madhatter_ Teacher

I’m having trouble fixing a warning that says “React Hook useEffect has a missing dependency”. I’m a new developer and I’m using React Hooks for my project. I’m trying to update my app state every time the component mounts, so ...Read more

I’m having trouble fixing a warning that says “React Hook useEffect has a missing dependency”. I’m a new developer and I’m using React Hooks for my project. I’m trying to update my app state every time the component mounts, so I’m using a useEffect hook. However, when I run my code, I get this warning in my console that says I’m missing a dependency. I researched online and saw that this warning means I should add a dependency to the useEffect hook, but I’m not sure how to do that.
Here’s a simplified version of my code:

import React, { useState, useEffect } from 'react';
function App() {
const [count, setCount] = useState(0);
useEffect(() => {
setCount(count + 1);
}, []);
return (

Count: {count}

);
}

This is the code I’m using and it’s producing the console warning. How can I fix this warning? What dependency do I need to add to the useEffect hook? How do I add this dependency to my code? I’m a bit lost and would really appreciate some help.

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dependencyfixreactjsuseEffectwarning
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30
    • Share
      Share
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Asked: 6 years agoIn: Programming

1.7 Lab: Adjust values in a list by normalizing [Python]

leguizamon_ailen Begginer

I am having some trouble with normalizing the values of a list in Python. I am working on a project where I need to compare two different sets of data, but the values are on different scales. I have a ...Read more

I am having some trouble with normalizing the values of a list in Python. I am working on a project where I need to compare two different sets of data, but the values are on different scales. I have a list of values that range from 0 to 200, and another list with values ranging from 0 to 10. To normalize them, I have been trying to create a function that will take in the original list and return the normalized list.
Here is the code that I have been working with:

def normalize_data(data):
max_val = max(data)
min_val = min(data)
normalized = []

for val in data:
normalized.append((val - min_val) / (max_val - min_val))

return normalized
data1 = [24, 35, 100, 160, 199]
data2 = [2, 4, 6, 8, 10]
norm_data1 = normalize_data(data1)
norm_data2 = normalize_data(data2)

When I run this code, I get the normalized values, but they are not what I was expecting. The values in the first list are normalized to be between 0 and 1, which is correct, but the values in the second list are divided by 20 instead of 10. I’m not sure why this is happening, and I’ve tried changing the values in the function, but I still can’t seem to get it right. Can anyone please help me figure out what I’m doing wrong?

Read less
algorithmlistnormalizationpythonvalues
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30
    • Share
      Share
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  • 254
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Asked: 6 years agoIn: Programming

Pine Script error: script could not be translated from `null`

crisroxz Teacher

I am relatively new to Pine Script and I am trying to create a script that would alert me whenever the price of a stock reaches certain levels. Here is my code: study(title="Price Alert", overlay=true) alertcondition(title='Price Alert', message='The price ...Read more

I am relatively new to Pine Script and I am trying to create a script that would alert me whenever the price of a stock reaches certain levels. Here is my code:

study(title="Price Alert", overlay=true)
alertcondition(title='Price Alert', message='The price of this stock has reached 100', condition=close > 100)

However, when I try to compile this code, I get an error message that says “Script could not be translated from null”. I have tried looking through the Pine Script documentation and searching online for solutions, but I haven’t been able to find anything that addresses this issue. Can someone with more experience in Pine Script help me figure out what is causing this error and how to fix it?
In addition to the code above, I have also tried creating a similar script that would alert me when the price reaches a certain moving average, but I am still encountering the same error message. Here is the code for that script:

study(title="MA Alert", overlay=true)
ma = sma(close, 20)
alertcondition(title='MA Alert', message='The price of this stock has crossed its 20-period moving average', condition=close > ma)

Any assistance with resolving this error would be greatly appreciated. Thank you in advance for your help!

Read less
algorithmic tradingPine Scriptprogrammingtechnical analysistradingview
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30
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Asked: 5 years agoIn: Programming

Name NLTK is not defined.

agustinazuaje Begginer

I’m a beginner programmer trying to work with Natural Language Toolkit (nltk) in Python but every time I run my code, I keep getting the error message “NameError: name ‘nltk’ is not defined”. I have tried looking through the documentation ...Read more

I’m a beginner programmer trying to work with Natural Language Toolkit (nltk) in Python but every time I run my code, I keep getting the error message “NameError: name ‘nltk’ is not defined”. I have tried looking through the documentation and searching online for a solution, but none of the suggestions I came across worked for me.
Here is a snippet of my code:

import nltk
from nltk.tokenize import word_tokenize
text = "This is a sample sentence."
tokens = word_tokenize(text)
print(tokens)

When I run this code, I keep getting the error message mentioned above. I have also tried installing and reinstalling nltk using the pip install command, but it still does not work. I have also checked that I have Installed the necessary dependencies like numpy, however, the error still persists. From the error message, it looks like Python is unable to recognize the nltk module. I would appreciate any help in resolving this issue.

Read less
code errorname errorNLTKprogrammingpython
  1. utxpiv_ Begginer
    Added an answer about 2 weeks ago

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
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    • Share
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  • 415
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