def __enter__(self):
        _local.get_local_context()._executing_async.append(self._async)
        return self
Returns the number of fields in the Layer.
dataset/ETHPy150Open Workiva/furious/furious/context/_execution.py/_ExecutionContext.__enter__--crossover with--dataset/ETHPy150Open dcramer/django-compositepks/django/contrib/gis/gdal/layer.py/Layer.num_fields