bw2io.modified_database

Module Contents

Classes

ModifiedDatabase

Find relationships between foreground data data and background database named ref_database_name.

class bw2io.modified_database.ModifiedDatabase(data, ref_database_name, from_simapro=False)

Bases: object

Find relationships between foreground data data and background database named ref_database_name.

Each activity and exchange is summarized in a hash, a small set of letters that summarizes all relevant attributes.

foreground_activities_mapping:

hash: dataset

foreground_exchanges_mapping:

hash: exchange

foreground_activities:

activity hash: set of (exchange hash, amount) exchange tuples.

background_activities_mapping:

hash: Activity

background_exchanges_mapping:

hash: Exchange

background_activities:

activity hash: set of (Exchange hash, amount) exchange tuples

add_to_background_exchanges_mapping(exc)

assert_data_fully_linked()

get_reason(exc_tuple, data)

Get reason why exc_tuple not in data. Reasons are: 1) Changed amount 2) Missing

hash_background_exchanges(activity)

hash_foreground_exchanges(activity)

iterate_modified()

Return data on modified activities

iterate_unmatched()

Return data on activities in data which can’t be found in ref_database_name.

load_datasets()

Determine which datasets are modified by comparing the exchanges values.

Specifically, compare the set of (input activity hashes, amount_as_string) values.

If the name or other important attributes changed, then there won’t be a correspondence at all, so the dataset is treated as modified in any case.

prune()