<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_all():
 """Get all subclasses of BaseImporter from module and return and generator """


    _import_all_importer_files()

    for module in (value for key, value in globals().items()
                   if key in __all__):
        for klass_name, klass in inspect.getmembers(module, inspect.isclass):
            if klass is not BaseImporter and issubclass(klass, BaseImporter):
                yield klass

    for klass in _get_importers_from_entry_points():
        yield klass