Checks wether matplotlib's backend is interactive even though matplotlib is not required and not installed

[keuj6]

Environment data

• "Python Debugger" extension: v2024.14.0 (debugpy-1.8.9)
• OS and version: macOS Sequoia 15.1.1
• Python version: 3.12.7
• VS Code: 1.95.3
• colour-science: 0.4.6

Actual behavior

In VS Code, I work on a Python script importing colour-science without matplotlib installed:

• The script runs without raising errors
• Setting a breakpoint and attempting to debug causes the VS Code Python debugger to crash/stop

Error raised:

Exception has occurred: ModuleNotFoundError
No module named 'matplotlib.rcsetup'; 'matplotlib' is not a package
AttributeError: path

During handling of the above exception, another exception occurred:

File "/My/Path/.vscode/extensions/ms-python.debugpy-2024.14.0-darwin-arm64/bundled/libs/debugpy/_vendored/pydevd/pydev_ipython/matplotlibtools.py", line 59, in is_interactive_backend
from matplotlib.rcsetup import interactive_bk, non_interactive_bk # @UnresolvedImport
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/My/Path/.vscode/extensions/ms-python.debugpy-2024.14.0-darwin-arm64/bundled/libs/debugpy/_vendored/pydevd/pydev_ipython/matplotlibtools.py", line 99, in activate_matplotlib
is_interactive = is_interactive_backend(backend)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/My/Path/Documents/python_projects/reproduce_debugpy_error/hello.py", line 9, in
main()
^^^^
ModuleNotFoundError: No module named 'matplotlib.rcsetup'; 'matplotlib' is not a package

Expected behavior

The debugger should stop at breakpoint and allow stepping through the code

Steps to reproduce:

1. Initialize a new project with uv and add colour-science package

uv init
uv add colour-science

2. Add import colour in default hello.py

import colour


def main():
    print("Hello from reproduce-debugpy-error!")


if __name__ == "__main__":
    main()

3. Add a breakpoint anywhere and run Python Debugger: Debug Python File