SUM = 0

def test():
    global SUM
    
    for i in range(10):
        gen = inner_test()
        gen.send(None)

        try:
            gen.send(None)
        except StopIteration as ex:
            SUM += ex.args[0]

def inner_test():
    yield
    return 1

test()
print(SUM, 'should be == 10')

import gc
gc.collect()

print(len([obj for obj in gc.get_objects() if isinstance(obj, StopIteration)]), 'should be == 0')