Iterable, iterator and generator

iterable_iterator_examples.py

for a in TenIntegers():
    print(a)

manual_iterator = TenIntegers(100)
for _ in range(0, 10):
    print(manual_iterator.next())

# iterating 11 times, it raises an error
for _ in range(0, 11):
    print(manual_iterator.next())

ten_integers_generator.py

def ten_integers(start_from=0):
    for current in range(start_from, start_from + 10):
        yield current

ten_integers_generator_examples.py

for a in ten_integers():
    print(a)
    
manual_iterator = ten_integers(100)
for _ in range(0, 10):
    print(manual_iterator.__next__())

TenIntegers.py

class TenIntegers:
    
    def __init__(self, start_from=0):
        self.current=start_from
        self.max = self.current + 10
    
    def __iter__(self):
        '''
        This method makes the object iterable
        '''
        return self
    
    def __next__(self):
        '''
        This is the actual method used on iteration
        '''
        if self.current < self.max:
            current_value = self.current
            self.current += 1
            return current_value
        else:
            # This error is raised to stop the iteration
            raise StopIteration
    
    # Useful to call it manually
    next = __next__