human
I wrote the below code

    def mapiter(mappings):
        if isinstance(mappings, dict):
            return iteritems(mappings)
        else:
            return iter(mappings)
    return dict(((name, out_mapping_type([transform_fun(vpkg, pset) for (vpkg, pset) in mapiter(mappings)])) for (name, mappings) in providers.items()))

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def _transform(providers, transform_fun, out_mapping_type=dict):