[Python] Python thread.join(timeout) not timing out

I am using threading python module. I want to execute a function which runs an expression entered by a user. I want to wait for it to finish execution or until a timeout period is reached. The following code should timeout after 5 second, but it never times out.

def longFunc():
# this expression could be entered by the user
return 45 ** 10 ** 1000

thread = threading.Thread(target=longFunc, args=(), daemon=True)
thread.start()
thread.join(5.0)
print("end") # never reaches this point


Why is this and how can I fix this behaviour? Should I try to use multiprocessing instead?

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