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`daemon` flag cannot be changed after thread is started, the documentation is right and the code of the daemon setter is actually:
 if self._started.is_set():
 raise RuntimeError("cannot set daemon status of active thread")
But still it looks like a code review problem: all your daemonic threads should be created as daemonic.
Breaking the `daemon` semantics looks like a bug magnet: any future uses of non-daemonic threads (by an "experienced" developer of your team, specifically needing a non-daemon thread for a specific task) will behave as a deamon thread and the specific task may not be correctly executed (like, logging an exception?).