<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _name_lookup(names):
 r"""Create an io helper to convert an integer to a named value."""

    mapper = dict(zip(range(len(names)), names))

    def lookup(val):
        return mapper.get(val, 'Unknown')
    return lookup