def regular_function():
	return 2
 
print regular_function()
 
try:
	for i in regular_function():
		print i
except:
	print "Oops, you can't iterate over a regular function!"
 
def generator():
	n = 0
	while True:
		yield n
		n += 1
 
print generator()
print "Huh, that looks funny..."
 
for i in generator():
	print i
	if i >= 5:
		print "We should stop this, since it's an infinite loop..."
		break
 
print "Much better..."
 
import itertools
 
print [i for i in itertools.takewhile(lambda x:x<5, generator())]
print "Neat, we can use itertools stuff with generators!"

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