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Currently it is not possible to "kill" thread which is blocked. The rationale for this is handling situations when thread is blocked - e.g. when thread is quering DB when lock occurred on Database. In this case, the main thread has no way how to stop the blocked thread. Killing a thread is also popular question - see .
pthread library and Windows API contains mechanisms for forced termination of threads - see  and . It is also simple to use them using ctypes library but after this action one need to "clean" internal data structures which is bad practice:
import time import threading import ctypes
# blocked thread handler time.sleep(1000)
t = threading.Thread(name='bar', target=handler) libpt = ctypes.cdll.LoadLibrary("libpthread.so.0")
# This is nasty cleaning of internal python structures
Is if feasible to add canceling threads to python threading library? I am willing to help creating a patch (at least for linux).
 https://stackoverflow.com/questions/323972/is-there-any-way-to-kill-a-thread  https://www.geeksforgeeks.org/python-different-ways-to-kill-a-thread/  http://man7.org/linux/man-pages/man3/pthread_cancel.3.html  https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-pr...