Simple decorator with iterators usage.

example_decorator_iterator.py

def is_admin(func):
    def wrapper(*args, **kwargs):
        for item in args:
            if item['is_admin']:
                yield item
    return wrapper


@is_admin
def foo(user):
    print(user)


for item in foo(
    {'name': 'Daniel', 'is_admin': True},
    {'name': 'Josué', 'is_admin': False},
    {'name': 'Lucas', 'is_admin': True}
):
    print(item)

# Will print only admin users.
# {'name': 'Daniel', 'is_admin': True}
# {'name': 'Lucas', 'is_admin': True}