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Natural Numbers Iterators

Build a simple NumbersIterator that iterates over natural numbers starting in 1. Example of usage:

iterator = iter(NumbersIterator())

print(next(iterator))  # 1
print(next(iterator))  # 2
print(next(iterator))  # 3
print(next(iterator))  # 4

Warning! This is an infinite iterator. Natural numbers go on forever.

Test Cases

test natural numbers - Run Test 

def test_natural_numbers():
    iterator = iter(NumbersIterator())

    assert next(iterator) == 1
    assert next(iterator) == 2
    assert next(iterator) == 3
    assert next(iterator) == 4
class NumbersIterator(object): def __init__(self): self.next_number = 1 def __iter__(self): return self def __next__(self): pass next = __next__ # iterator = iter(NumbersIterator()) # # print(next(iterator)) # print(next(iterator)) # print(next(iterator))
Python 3.6