How to handle Python exception in Threads?

Python Server Side Programming Programming

In the code given below, a thread is started. The thread waits for few seconds and checks for an event and if it is found, it stops, else an Exception is thrown.

I want to catch this Exception and would need help in doing so.

import threading
import time
def thread(args1, stop_event):
print "start thread"
stop_event.wait(12)
if not stop_event.is_set():
raise Exception("boom!")
pass
try:
t_stop = threading.Event()
t = threading.Thread(target=thread, args=(1, t_stop))
t.start()
time.sleep(15)
print "stop thread!"
t_stop.set()
except Exception as e:
print " It took too long"

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1 Answer

Rajendra Dharmkar

Answered on 6th Dec, 2017

The given code is rewritten to catch the exception

import sys
import threading
import time
import Queue
def thread(args1, stop_event, queue_obj):
print "start thread"
stop_event.wait(12)
if not stop_event.is_set():
try:
raise Exception("boom!")
except Exception:
queue_obj.put(sys.exc_info())
pass

try:
queue_obj = Queue.Queue()
t_stop = threading.Event()
t = threading.Thread(target=thread, args=(1, t_stop, queue_obj))
t.start()
time.sleep(15)
print "stop thread!"
t_stop.set()
try:
exc = queue_obj.get(block=False)
except Queue.Empty:
pass
else:
exc_type, exc_obj, exc_trace = exc
print exc_obj

except Exception as e:
print "It took too long"

OUTPUT

C:/Users/TutorialsPoint1/~.py
start thread
stop thread!
boom!

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How to handle Python exception in Threads?

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