Python asynchronous/threads debugging in Visual Studio Code

Question

I'm using Visual Studio Code for writing my python application. Inspecting variables and things like setting a watch in the left debugging pane works OK if I write a simple synchronous one-file program.

However, I have code with classes in multiple files, and use various callbacks from other modules. Some which start a new thread.

One of those modules is canopen I can step thru my code, but when I enter the second line (below)

can0 = canopen.Network() can0.connect(channel='can0', bustype='socketcan') 

then the call stack changes from:

CALL STACK paused on breakpoint main <module> 

to

CALL STACK paused on breakpoint MainThread Thread#15034......... 

and simultaneously

• the variables pane clears

• and the watches in my watch window shows:

  can0: not available

How can I (setup VS studio code with Python to) inspect/debug my python code with various threads and code in various files?

Regards, Bas

Answer 1

New debugger is capable of debugging async applications. Check out how to set it up How to update ptvsd used by Visual Studio Code in debug mode And don't forget to add "subProcess": true, in launch.json