stellar | Simple start to a framework for Meteor | Web Framework library

Error

NoReverseMatch at /cart/ Reverse for 'ProductView' not found. 'ProductView' is not a valid view function or pattern name. Request Method: GET Request URL: http://127.0.0.1:8000/cart/ Django Version: 3.2.3 Exception Type: NoReverseMatch Exception Value:
Reverse for 'ProductView' not found. 'ProductView' is not a valid view function or pattern name.

Error Screenshot

This is where it shows me error, when I try to add a product to cart sessions,tho the product it added to cart sessions but when the url for cart-details is called, while loading the main base.html file it gives me a error that productView cannot be found

ProductApp Templates 'app/base.html'

I am new to python/coding and I'm seeking some basic help to pull some elements from what I think is a dictionary. So I am executing the below.

So, I have a program that takes 4 different lists and combines them into one list with every possible combination between all of the values of the lists.

Here is what I am trying to accomplish from the page https://stellar.expert/explorer/public/asset/native?cursor=15297&filter=asset-holders

1. extract the data in the table columns (Account and Account balance)
2. write the extracted data fields into a text file.
3. I am trying to extract multiple pages like from 15297 to 15500.

I am still very new to python and web scraping and I had been struggling to get the desired output. Help will be very appreciated. Thank you.

I'm trying to follow this guide: https://spark.apache.org/docs/latest/structured-streaming-kafka-integration.html But I don't realize why I'm it's most of the time not writing data to the console, and why its spamming execution thread logging?
Do I need to configure something? This is my code:

I am doing this dropdown menu for my team's websites, and I want to have a dropdown ppear next to it when you hover over a link in the 1st dropdown:

I am trying to chain some API calls and I think I am confusing some concepts. Would love some clarification & code samples.

I have implemented these functions...

I am working on the following project and I am having issues with calculating the yearly beta, alpha and rsquared instead of a single one of each one for the whole 6 years of data I have.

I have a set of 3d points (I generate the positions of planets and moons in a stellar system from Keplers equations) I have the coordinates of all points as x,y,z, where the central star is 0,0,0. The code to produce the points works perfectly.

However, at the moment I plot a visualisation of this system from above - so I just ignore the z component for the purposes of visualisation and plot the x and y to the canvas as-is. This works as intended.

How would I generate x and y coordinates for plotting to the canvas that take into account the z coordinate, so that I can plot a view from another angle apart from directly above?

The only library I can use apart from the standard one would be numpy. I cannot use Matplotlib.

edit thanks to the comments I can now clarify with some psudocode.

Assume I have a bunch of points that have an xyz position.

What I currently do:

canvas.plot(point.x)

canvas.plot(point.y)

ignoring point z - so that it is as if all z's are 0 and it is viewed from 'above'

So that I can use my current plotting code - which takes into account scale and offsets to do with the canvas, I need new x and y coordinates that are as if the view is from another angle other than 'above'.

It seems from the helpful comments what I have to do is rotate the whole coordinate system so that it has a new z axis that is a result of a rotation of the whole system about the x and y axis.

Something like the following psudocode would do.