programming

Home/programming

Questions and answers begin here Latest Questions

Asked: 6 months agoIn:
Teacher

I am having trouble with concatenating strings in my Python code. I have tried using the `+` operator to combine two strings, but that doesn’t seem to be working. Here’s what I have tried so far: “`python string1 = “Hello”Read more

I am having trouble with concatenating strings in my Python code. I have tried using the `+` operator to combine two strings, but that doesn’t seem to be working. Here’s what I have tried so far:
“`python
string1 = “Hello”
string2 = “world”
result = string1 + string2
print(result)
“`
However, when I run this code, I am getting an error that says “unsupported operand type(s) for +: ‘int’ and ‘str'”. I’m not sure what this means or how to fix it. Can you please help me figure out what I’m doing wrong?
I have also tried using the `join()` method instead, like this:
“`python
string1 = “Hello”
string2 = “world”
result = “”.join([string1, string2])
print(result)
“`
But this is also not working. When I run this code, I just get a blank line outputted to the console. I’m not sure why this is happening or how to fix it. Do you have any suggestions for what else I could try?

Read less
codeconcatenationprogrammingstrings
  1. utxpiv_ Begginer

    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
Asked: 11 months agoIn:
Begginer

I have been trying to work with Spark for a while, and I seem to have encountered a problem when I was trying to run some Python code. I am working on a project that requires me to use Spark ...Read more

I have been trying to work with Spark for a while, and I seem to have encountered a problem when I was trying to run some Python code. I am working on a project that requires me to use Spark in Python, but I keep getting a Py4JError: Answer from Java side is empty error when I try to run my script. I have done some research, and it seems like there could be many reasons for this error, but I cannot find a solution for my particular case.

Here’s the relevant code snippet that’s causing the error:


from pyspark.sql import SparkSession

spark = SparkSession
.builder
.appName("myApp")
.config("spark.some.config.option", "some-value")
.getOrCreate()

data = spark.read.load("some_file.csv", format="csv", header="true")

I am pretty sure that the CSV file exists because I have checked multiple times. I have even tried changing the format to “text” or “json” just to be sure, but I keep getting the same error. I have also tried running Spark in standalone mode, but that didn’t help either. I am starting to suspect that there is something wrong with my Spark installation or configuration. I have tried reinstalling Spark, but that didn’t help either. I would appreciate any help or suggestions anyone can give me to solve this error. Thank you in advance!

Read less
Apache SparkBig DatajavaprogrammingPy4JErrorpython
  1. utxpiv_ Begginer

    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
Asked: 4 years agoIn:
Teacher

I recently started working with NetworkX in Python, and I’m trying to add new nodes to a graph using the `add_nodes_from()` method. However, upon trying to run my code, I receive the error message “module ‘networkx’ has no attribute ‘add_nodes_from'”. ...Read more

I recently started working with NetworkX in Python, and I’m trying to add new nodes to a graph using the `add_nodes_from()` method. However, upon trying to run my code, I receive the error message “module ‘networkx’ has no attribute ‘add_nodes_from'”. I have double-checked my code to ensure that I am calling the method correctly, but I am still receiving the same error message. Here’s an example of my code:

import networkx as nx
G = nx.Graph()
G.add_nodes_from([1, 2, 3])

I’m not sure what could be causing this error, as it seems like my code should be working. Do you have any suggestions for things I could try to fix this issue?
Additionally, I noticed that the version of NetworkX that I installed is different from the version that is currently listed on their website. Could this be causing compatibility issues with the `add_nodes_from()` method? If so, is there a way for me to downgrade my version of NetworkX to match the version listed on the website, or do I need to make changes to my code to accommodate the version that I have installed?

Read less
add_nodes_fromattribute-errorgraphnetworkxprogrammingpython
  1. utxpiv_ Begginer

    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
Asked: 5 years agoIn:
Teacher

I’m a college student majoring in computer science and I have been working on a project that involves encryption and decryption of data. I’ve written a program to decrypt a file encrypted with AES in CBC mode, but I keep ...Read more

I’m a college student majoring in computer science and I have been working on a project that involves encryption and decryption of data. I’ve written a program to decrypt a file encrypted with AES in CBC mode, but I keep getting an error message saying “Given final block not properly padded”.
Here is the relevant part of my code:

try {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] decrypted = cipher.doFinal(encrypted);
return new String(decrypted);
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
e.printStackTrace();
return null;
}

I looked up the error message online and found some explanations, but I still don’t understand what’s going wrong with my code. Can someone please help me?

Read less
decryptionencryptionjavapaddingprogramming
  1. utxpiv_ Begginer

    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
Asked: 5 years agoIn:
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

    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
Asked: 6 years agoIn:
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

    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
Asked: 6 years agoIn:
Begginer

I’m trying to create a conditional loop with outputs in my code, but I seem to be missing something. Here is a simplified version of what I currently have: function printNumbers(){ let numArr = [1, 2, 3, ...Read more

I’m trying to create a conditional loop with outputs in my code, but I seem to be missing something. Here is a simplified version of what I currently have:

function printNumbers(){
let numArr = [1, 2, 3, 4, 5];
for(let i=0; i
This code works as expected and outputs the numbers 1-5 along with whether they are odd or even. However, what I want to do is add a condition where, if the number is even, it also outputs the next number in the array. So for example, the output would be "2 is even, the next number is 3" for the number 2.
I've tried adding another if statement inside the existing one like this:

function printNumbers(){
let numArr = [1, 2, 3, 4, 5];
for(let i=0; i
But now the output shows the next number for every even number, even if it's the last number in the array. How can I modify my code to only show the next number for even numbers that aren't the last? Any help would be greatly appreciated!

Read less
codeconditional loopoutputprogrammingsyntax
  1. utxpiv_ Begginer

    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