Python : Find Sum using Parallel Procesing using Common Aggregator

	import concurrent.futures
	import threading
	a=0
	def fn(i):
	global a
	a=a+i
	print(a,threading.get_native_id())
	if __name__ == '__main__':
	with concurrent.futures.ThreadPoolExecutor(3) as ep:
	ep.map(fn, range(0, 100))
	print("final " + str(a))

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