def from_iterable(iterables):
    for it in iterables:
        for element in it:
            yield element
Add in multiple elements in one method call. 
dataset/ETHPy150Open divio/django-cms/cms/sitemaps/cms_sitemap.py/from_iterable--crossover with--dataset/ETHPy150Open swordapp/python-client-sword2/sword2/atom_objects.py/Entry.add_fields