Warnings are not shown while evaluating expressions in the debug console

[david-cortes]

Environment data

• debugpy version: 1.5.0
• OS and version: debian sid
• Python version (& distribution if applicable, e.g. Anaconda): 3.9.7, from anaconda
• Using VS Code or Visual Studio: vscode

Steps to reproduce:

1. Put a breakpoint right after a function that would throw a warning.
2. Execute code that would reach the breakpoint and would get the warning issued.

Actual behavior

Does not show the warning anywhere while debugging.

Expected behavior

Should show warnings in the terminal pane while debugging, in the same part where stdout is written to.

[fabioz]

Turning on/off warnings is something that can change the behavior of applications. Some frameworks (such as pytest) do enable the warnings (and enabling warnings when testing does make sense), but I think the debugger should be agnostic here.

-- just because you're using the debugger doesn't mean you want the warnings... if you do want warnings, I think you should explicitly enable that when launching the debugger and not having the debugger automatically do that (so, I think this is out of the scope of the debugger).

Given that, I'm currently -1 on this request... @int19h do you have different thoughts here or can I close the issue?

[david-cortes]

Turning on/off warnings is something that can change the behavior of applications. Some frameworks (such as pytest) do enable the warnings (and enabling warnings when testing does make sense), but I think the debugger should be agnostic here.

-- just because you're using the debugger doesn't mean you want the warnings... if you do want warnings, I think you should explicitly enable that when launching the debugger and not having the debugger automatically do that (so, I think this is out of the scope of the debugger).

Given that, I'm currently -1 on this request... @int19h do you have different thoughts here or can I close the issue?

Indeed - that's why they are important for debugging purposes. The default in a python interpreter is to show all warnings, while disabling them requires user action - why would a debugger behave differently from the regular interpreter in that regard?

BTW, there's no button to turn warnings on or off in the debug panel.

[fabioz]

Indeed - that's why they are important for debugging purposes. The default in a python interpreter is to show all warnings, while disabling them requires user action - why would a debugger behave differently from the regular interpreter in that regard?

BTW, there's no button to turn warnings on or off in the debug panel.

Sorry, I don't follow here... you mean you usually get warnings but not when debugging? Can you give some code example to reproduce this?

[david-cortes]

Tried again with the latest version of vscode and the debugger - now warnings are shown correctly in the non-interactive terminal, but are not printed when executed as a statement in the debugger console:

[fabioz]

Thanks for the explanation... the warnings in this case were really silenced as a part of #190.

It seems maybe it got to far when it silenced warnings when evaluating user expressions from the debug console.