python yield send

def psychologist():
	print 'Please tell me your problems'
	while True:
		answer = (yield)
		if answer is not None:
			if answer.endswith('?'):
				print ("Don't ask yourself too much questions")
			elif 'good' in answer:
				print "A that's good, go on"
			elif 'bad' in answer:
				print "Don't be so negative"

free = psychologist()
free.next()
#Please tell me your problems
free.send('I feel bad')
#Don't be so negative
free.send("Why I shouldn't ?")
#Don't ask yourself too much questions
free.send("ok then i should find what is good for me")
#A that's good, go on