How to attach debugger to a python subproccess?

Question

I need to debug a child process spawned by multiprocessing.Process(). The pdb degugger seems to be unaware of forking and unable to attach to alrea

Answer 1

Here is the version of the ForkedPdb(Romuald's Solution) which will work for Windows and *nix based systems.

import sys
import pdb
import win32console


class MyHandle():
    def __init__(self):
        self.screenBuffer = win32console.GetStdHandle(win32console.STD_INPUT_HANDLE)
    
    def readline(self):
        return self.screenBuffer.ReadConsole(1000)

class ForkedPdb(pdb.Pdb):
    def interaction(self, *args, **kwargs):
        _stdin = sys.stdin
        try:
            if sys.platform == "win32":
                sys.stdin = MyHandle()
            else:
                sys.stdin = open('/dev/stdin')
            pdb.Pdb.interaction(self, *args, **kwargs)
        finally:
            sys.stdin = _stdin