How to attach debugger to a python subproccess?

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I’ve been searching for a simple to solution for this problem and came up with this:

import sys
import pdb

class ForkedPdb(pdb.Pdb):
    """A Pdb subclass that may be used
    from a forked multiprocessing child

    """
    def interaction(self, *args, **kwargs):
        _stdin = sys.stdin
        try:
            sys.stdin = open('/dev/stdin')
            pdb.Pdb.interaction(self, *args, **kwargs)
        finally:
            sys.stdin = _stdin

Use it the same way you might use the classic Pdb:

ForkedPdb().set_trace()

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