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Asked: 4 years agoIn:
Teacher

I’m new to Python programming and I’m trying to create a script that interacts with my Azure Blob storage account. I followed the instruction on the Azure Portal to get the required credentials, and then used the Azure SDK for ...Read more

I’m new to Python programming and I’m trying to create a script that interacts with my Azure Blob storage account. I followed the instruction on the Azure Portal to get the required credentials, and then used the Azure SDK for Python to write some code to perform actions such as listing blobs, uploading and downloading blobs, etc. However, when I try to import the `BlockBlobService` class from the `azure.storage.blob` module, I encounter the error “Cannot import name ‘BlockBlobService'”. I am not sure what’s going on, and I’ve searched through several websites and documentation to try to fix it to no avail.
Here’s my code:
“`python
from azure.storage.blob import BlockBlobService
account_name = ‘myaccountname’
account_key = ‘myaccountkey’
container_name = ‘mycontainername’
block_blob_service = BlockBlobService(account_name=account_name, account_key=account_key)
blobs = block_blob_service.list_blobs(container_name)
for blob in blobs:
print(blob.name)
“`
When I run this script, I get the error message “Cannot import name ‘BlockBlobService'”. I am not sure what the issue is, and I’ve checked that I have installed the `azure-storage-blob` module using pip. I’m also certain that my credentials are correct because I can see the blobs in my container when I use the Azure Portal dashboard. Can anyone please tell me what I’m doing wrong and how I can retrieve the blobs using this script? Your help would be greatly appreciated.

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Asked: 5 years agoIn:
Begginer

I am new to programming and I am struggling with a problem. I have created a Go program in a Linux environment and I keep receiving the “exec format error” message when trying to execute it. I have checked that ...Read more

I am new to programming and I am struggling with a problem.
I have created a Go program in a Linux environment and I keep receiving the “exec format error” message when trying to execute it. I have checked that the file has the proper permissions, but the issue persists.
Here is an example of my code:

package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}

I have saved this code to a file named hello.go and I have compiled it using the command “go build hello.go”. After that, I have tried executing the compiled file using “./hello” and I receive the “exec format error” message.
Could someone help me understand why this is happening and how to resolve it?

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exec format errorgoinitlinuxuser process
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Asked: 6 years agoIn:
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?

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Asked: 5 years agoIn:
Teacher

I have been trying to open an image using the Image module in Python, but I keep getting an error saying “cannot identify image file”. I’m not sure what I’m doing wrong, as the file definitely exists in the correct ...Read more

I have been trying to open an image using the Image module in Python, but I keep getting an error saying “cannot identify image file”. I’m not sure what I’m doing wrong, as the file definitely exists in the correct location. Here is the code that I’m using:

from PIL import Image
img = Image.open('/path/to/my/image.jpg')
img.show()

I have also tried using the Image.open().verify() method to see if it provides any more information about the error, but it just gives me the same “cannot identify image file” message. I have double checked the path to make sure that it is correct, and I have even tried changing the file extension from .jpg to .png, but nothing seems to be working.
Another thing that I noticed when looking at the image file is that it is pretty large (over 10 MB), but I wouldn’t think that this would be a problem for the Image module. Is there something wrong with the code that I’m using? Or could it be an issue with the image file itself? Any help would be greatly appreciated.

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Asked: 5 years agoIn:
Begginer

I’m building a browser extension that uses the WebExtensions API. I have a content script with the following code: “`javascript browser.runtime.onMessage.addListener((message) => { if (message.type === ‘get-browser’) { const browserName = navigator.userAgent.includes(‘Firefox’) ? ‘Firefox’ ...Read more

I’m building a browser extension that uses the WebExtensions API. I have a content script with the following code:
“`javascript
browser.runtime.onMessage.addListener((message) => {
if (message.type === ‘get-browser’) {
const browserName = navigator.userAgent.includes(‘Firefox’) ? ‘Firefox’ : ‘Chrome’;
return Promise.resolve({ browser: browserName });
}
});
“`
When I try to load the extension in Firefox, I get an error in the console:
“`
Error: Error: browser.runtime.lastError: Could not establish connection. Receiving end does not exist.
“`
I’m not sure why this error is happening. I’ve looked at the documentation for `browser.runtime.sendMessage` and `browser.runtime.onMessage.addListener`, and it seems like my code should be correct. I’ve also searched on Google and Stack Overflow, but I can’t seem to find a solution.
One thing I noticed is that the error only occurs if I have the `permissions` key in my `manifest.json` file. If I remove it, the error goes away. But I need the `permissions` key to access the `tabs` API in my background script. I’m not sure if there’s a conflict between the two APIs, or if I’m doing something else wrong. Any help would be appreciated.

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Asked: 4 years agoIn:
Begginer

I am a coding newbie and I am trying to run a machine learning program on my Python environment. However, I am encountering some issues with the shapes of arrays and broadcasting them. I am quite unsure of how to ...Read more

I am a coding newbie and I am trying to run a machine learning program on my Python environment. However, I am encountering some issues with the shapes of arrays and broadcasting them. I am quite unsure of how to handle this situation.
I have a series of arrays with differing shapes that I want to broadcast together to find their dot product. However, when I run my code, I get an `InvalidArgumentError` saying that the shapes of the arrays are not broadcastable. I am not sure how to go about rectifying this error. Here’s an example of my code:

import tensorflow as tf
a = tf.constant([[1, 2], [3, 4]])
b = tf.constant([10, 20])
c = tf.constant([[100], [200]])
result = tf.tensordot(a*b, c, axes=1)
with tf.session() as sess:
output = sess.run(result)

Can someone please help me understand why I am not able to broadcast the arrays and what I can do to fix this code? Thank you in advance for your help.

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arraysbroadcastingdebugginginvalidargumenterrornumpynumpy-broadcastingpython
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Asked: 5 years agoIn:
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.

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connectionerrorlocalhostmongodbNode.js
  1. scytheria.nel Teacher

    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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