Brightway2 input and output
This package provides tools for the import, export, and management of inventory databases and impact assessment methods. It is part of the Brightway2 LCA framework. Online documentation is available, and the source code is hosted on Bitbucket.
In contrast with previous IO functionality in Brightway2, brightway2-io uses an iterative approach to importing and linking data. First, data is extracted into a common format. Next, a series of strategies is employed to uniquely identify each dataset and link datasets internally and to the biosphere. Following internal linking, linking to other background datasets can be performed. Finally, database data is written to disk.
This approach offers a number of benefits that help mitigate some of the serious problems in existing inventory data formats: the number of unlinked exchanges can be easily seen, linking strategies can be iteratively applied, and intermediate results can be saved.
Here is a typical usage:
In : from bw2io import * In : so = SingleOutputEcospold2Importer("/path/to/ecoinvent/3.1/cutoff/datasets", "ecoinvent 3.1 cutoff") 11301/11301 (100%) |||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Time: 0:01:56 Converting to unicode Extracted 11301 datasets in 262.63 seconds In : so.apply_strategies() Applying strategy: remove_zero_amount_coproducts Applying strategy: remove_zero_amount_inputs_with_no_activity Applying strategy: es2_assign_only_product_with_amount_as_reference_product Applying strategy: assign_single_product_as_activity Applying strategy: create_composite_code Applying strategy: link_biosphere_by_flow_uuid Applying strategy: link_internal_technosphere_by_composite_code Applying strategy: delete_exchanges_missing_activity Applying strategy: delete_ghost_exchanges Applying strategy: mark_unlinked_exchanges In : so.statistics() 11301 datasets 521712 exchanges 0 unlinked exchanges Out: (11301, 521712, 0) In : so.write_database()
Note that brightway2-io can't magically make problems in databases go away.