# goal: 0 1 2 3 4 5 6 7 8 9

def generator_test():
    for i in range(10):
        def closure():
            bound_i = i
            def func():
                return bound_i
            return func
        yield closure()

for test in generator_test():
    print(test())

# result: 0 1 2 3 4 5 6 7 8 9

for test in list(generator_test()):
    print(test())

# result: 9 9 9 9 9 9 9 9 9 9