Pretty much a regular list, but when iterated over, it does not stop in the end. Instead, it iterates indefinitely.

InfiniteList.py

class InfiniteListEmptyError(Exception):
	pass


class InfiniteList(list):
	"""
	Pretty much a regular list, but when iterated over, it does not stop in the end. 
	Instead, it iterates indefinitely.
	"""

	def __init__(self, arg):
		super(InfiniteList, self).__init__(arg)

	def __getattr__(self, name):
		if name == "it":
			# get iterator
			result = object.__getattribute__(self, name)
		else:
			try:
				result = super(InfiniteList, self).__getattribute__(name)
			except AttributeError:
				try:
					result = self.it.__getattribute__(name)
				except AttributeError:
					# Initialize iterator cuz it's not initialized
					self.__iter__()
					result = self.it.__getattribute__(name)
		return result

	def __iter__(self):
		it = super(InfiniteList, self).__iter__()
		self.it = it
		return self

	def __next__(self):
		try:
			result = next(self.it)
		except StopIteration:
			self.__iter__()
			try:
				result = next(self.it)
			except StopIteration:
				raise InfiniteListEmptyError("Could not iterate. List is empty!")

		return result

# TESTS

a = InfiniteList(tuple()) #empty list

print(a)
print(a.__length_hint__()) #testing iterator attributes
print(a.__eq__([1,3,5])) # false

# should raise exception, since the list is empty
try:
	for i in a:
		print(i)
except InfiniteListEmptyError:
	print("List is empty!")

a.append(1)
a.extend([3,5])
print(a)
print(a[1])
print(a.__eq__([1,3,5])) #true

# infinite loop
for i in a:
	print(i)