Can't install a working version of vpython 7

[Ted Hoffman]

Hello,

I would like to be able to make use of vpython 7 in Spyder.

I am on a Windows 11 machine and I use Conda to create my python environments.

To install my environment I ran the following from a Anaconda Powershell prompt :
 conda create -n spyder-vpython spyder numpy scipy pandas matplotlib sympy cython vpython -c conda-forge

The results from the creation of the environment are shown in Figure1.png.

From the same Anaconda Powershell prompt I then ran:

conda activate spyder-vpython

spyder

In spyder I ran:

import txaio
import vpython as vp
txaio.use_twisted()
vp.box()

This code failed and I have attached the spyder console output (see attached ipython.html)

I am not sure what I might have done wrong with my installation. I would have preferred to use Visual Studio Code in place of Spyder, but I read in other correspondence that Visual Studio Code is not supported by vpython.

Thanks

[John]

Here is a video tutorial on how to install and run vpython in Visual Studio Code.

https://www.youtube.com/watch?v=MJiVtz4Uj7M

There is currently an issue of installing and running vpython in no_notebook mode with an IDE like spyder or Visual Studio Code. After installing vpython you will need to uninstall the packages autobahn and txaio . Then install autobahn version 21.11.1

    pip install autobahn==21.11.1

and this will install txaio version 22.2.1

You can try installing this version of autobahn to see if it will fix your issue with spyder.

John

[Ted Hoffman]

Hi John,

Thank you for your advice. I did what you said and it worked perfectly. vpython is now working inside of Visual Studio Code.

I knew about the WcWhorter video, but I was shying away from his approach because he was using a pip install of everything and I was trying to stay under the Anaconda umbrella. 

What I did was :

Installed a new python from python.org (version 3.10.4)

Opened a Windows command prompt window and started up Visual Studio Code

In Visual Studio Code:

Created a new directory to hold my vpython code

Selected the python interpreter (version 3.10.4)

ran:

After the installation I created a python file with the following code:

import vpython

ball = vpython.sphere()

while True:

    pass

When this file is run a new tab in Microsoft Edge (my default browser) opens and a sphere appears.

Without the "while True: pass" errors are generated. 

Thanks

Ted

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[Kevin Karplus]

Shouldn't the "while True" loop have a "rate(10)" statement, rather than a "pass", to keep the Python interpreter from busy-waiting?

Kevin Karplus   kar...@soe.ucsc.edu    http://www.soe.ucsc.edu/~karplus

Professor Emeritus, UC, Santa Cruz (on 10% recall for 2021–22)

Author of Applied Analog Electronics

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[Bruce Sherwood]

Yes, Kevin, you are right. However, somewhat to my surprise, there is one environment where an infinite loop on "pass" doesn't hang the browser, namely with installed Python and no-notebook. The reason for this is that the no-notebook environment uses threads.

Bruce