Multi thread in Python

	'''
	threading
	1. No return
	2. Can run seperatr function
	concurrent.futures
	1. Return
	2. Only run 1 Function in 1 map
	'''
	from concurrent.futures import *
	import threading
	import time
	l=[]
	def fn(i):
	print(f"{threading.get_native_id()}")
	time.sleep(i)
	l.append(i)
	return i
	t1=threading.Thread(target=fn,args=(1,))
	t1.start()
	t1.join()
	with ThreadPoolExecutor(2) as e:
	res=e.map(fn,[2,3])
	for i in res:print(i)
	print(l)

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