Asyncio with threading no exception throwing - python-3.x

Question

I have following code which will use asyncio and thread together. And the code works fine. But the problem is the code not throw exception some error happens.
import os
import time
from threading import Thread
import queue
import asyncio
def start_loop(loop):
asyncio.set_event_loop(loop)
loop.run_forever()
async def startProcess(name):
try:
#dfdf
print(' Started-----------> ',name)
while True:
print("Sleeping...",name)
time.sleep(5)
except Exception as e:
print('Caught exception in worker thread')
raise e
async def main_app():
loop1 = asyncio.new_event_loop()
process1_Tread = Thread(target=start_loop, args=(loop1,))
process1_Tread.start()
asyncio.run_coroutine_threadsafe(startProcess("Thread1"), loop1)
while True:
print("Sleeping main thread...")
time.sleep(5)
if __name__ == "__main__":
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(main_app())
finally:
print("Exit...")
For example if I add the line
try:
dfdf # to create exception
print(' Started-----------> ',name)
The thread not works but no error message shows. How can I enable if some error happens.

Answer 1

I resolved the problem by referring the answer here
Asyncio exception handler: not getting called until event loop thread stopped
Here is the full code
import os
import time
from threading import Thread
import queue
from pprint import pprint
import asyncio
def start_loop(loop):
asyncio.set_event_loop(loop)
loop.run_forever()
def exception_handler(loop, context):
print('Exception handler called')
pprint(context)
async def startProcess(name):
try:
dfdf
print(' Started-----------> ',name)
while True:
print("Sleeping...",name)
time.sleep(5)
return "Thread finish"
except Exception as e:
raise e
async def main_app():
loop1 = asyncio.new_event_loop()
loop1.set_exception_handler(exception_handler)
process1_Tread = Thread(target=start_loop, args=(loop1,))
process1_Tread.start()
fut = asyncio.run_coroutine_threadsafe(startProcess("Thread1"), loop1)
try:
print("success:", fut.result())
except:
print("exception:", fut.exception())
#consume signaling
while True:
print("Sleeping main thread...")
time.sleep(5)
if __name__ == "__main__":
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(main_app())
finally:
print("Exit...")