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Asked: 2026-05-20T09:23:10+00:00

The destroyed() signal can be trapped for a QObject, but I would like to

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The destroyed() signal can be trapped for a QObject, but I would like to simply test if the Python object still references a valid C++ Qt object. Is there a method for doing so directly?

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  1. Editorial Team

    If you import the sip module you can call its .isdeleted function.

    import sip
from PyQt4.QtCore import QObject

q = QObject()
sip.isdeleted(q)
False

sip.delete(q)
q
<PyQt4.QtCore.QObject object at 0x017CCA98>

q.isdeleted(q)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: underlying C/C++ object has been deleted
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