<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_exporter(obj, name):
 """ Get an exporter for the :param obj: object to export :type obj: :class:`Component <cqparts.Component>` :param name: registered name of exporter :type name: :class:`str` :return: an exporter instance of the given type :rtype: :class:`Exporter` :raises TypeError: if exporter cannot be found """

    if name not in exporter_index:
        raise TypeError(
            ("exporter type '%s' is not registered: " % name) +
            ("registered types: %r" % sorted(exporter_index.keys()))
        )

    for base_class in exporter_index[name]:
        if isinstance(obj, base_class):
            return exporter_index[name][base_class](obj)

    raise TypeError("exporter type '%s' for a %r is not registered" % (
        name, type(obj)
    ))