class Foo():
	a = 1
	b = 2
	c = 42
	d = ['hello', 'world']

	def __iter__(self):
		yield self.a
		yield self.b
		yield self.c
		yield from self.d


f = Foo()
for x in f:
	print(x)

# Should print the following:
# 1
# 2
# 42
# 'hello'
# 'world'