I'd suggest to rewrite it so:
```python
class VideoDescriptorFactory(object):
    """
    Instantiate descriptor with most properties.
    """
    @classmethod
    def get_location():
        return Location('i4x://org/course/video/SampleProblem1')

    @classmethod
    def create(**field_data):
        system = get_test_descriptor_system()
        location = VideoDescriptorFactory.get_location()
        return system.construct_xblock_from_class(
            VideoDescriptor,
            scope_ids=ScopeIds(None, None, location, location),
            field_data=DictFieldData(field_data),
        )
```