Afterthought

A debugpy alternative to pdb.post_mortem() that allows you to attach any debugger to your code after an exception has been raised.

By default it is setup and tested with vscode, but feel free to contribute to add support for other debuggers.

Installation

pip install afterthought

Usage

import afterthought


def bombs():
    a = []
    print(a[0])


if __name__ == "__main__":
    try:
        bombs()
    except Exception as e:
        afterthought.debug(e)

You can then connect using any tool that supports https://github.com/microsoft/debugpy

Function Decorators

You can also use the @afterthought.debug_on_exception decorator to automatically attach the debugger to any function that raises an exception.

import afterthought


@afterthought.debug_on_exception(IndexError)
def bombs():
    a = []
    print(a[0])


if __name__ == "__main__":
    bombs()

VSCode Configuration

Add the following configuration to your .vscode/launch.json file:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python Debugger: Remote Attach",
            "type": "debugpy",
            "request": "attach",
            "connect": {
                "host": "localhost",
                "port": 5678
            },
            "pathMappings": [
                {
                    "localRoot": "${workspaceFolder}",
                    "remoteRoot": "."
                }
            ]
        }
    ]
}