# Let's use the threading module.
# BTW, the function time.ctime() is useful to print out current system time.
import time
import threading

class myThread(threading.Thread):
	# The constructor is the place to identify attributes of each specific thread.
	def __init__(self, myNumber):
		threading.Thread.__init__(self)
		self.number = myNumber
		print "Initializing thread " + str(self.number)

	# run() defines the work that the thread is supposed to do
	# To simulate work, let's just "sleep" for 2 seconds.
	def run(self):
		print "Thread " + str(self.number) + " is starting :)"
		time.sleep(2)
		print "Thread " + str(self.number) + " is finished"

# main program
print "\nProgram starts:  " + time.ctime()
threadList = []

for i in range(1, 5):
	currentThread = myThread(i)
	threadList.append(currentThread)
	currentThread.start()

# Tell the main program to wait for all threads to finish
for t in threadList:
	t.join()

print "All done at " + time.ctime()