[Python] How to make a custom class work with the ‘for in’ loop in Python?

If I have a custom class, how can I make it work with a ‘for in’ loop, like this:

class number_range:
def __init__(self, start, end):
self.__data = []
for i in range(start, end):
self.__data.append(i)
#something that will allow the for in loop

numbers = number_range(1, 100)
for number in numbers:
print(number)

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