How to manually link in Brightway2 an imported exchange, given I have found the correct one in ecoinvent - brightway

Question

I have been linking my data automatically with
import functools
from bw2io.strategies import link_iterable_by_fields
sp.apply_strategy(functools.partial(
link_iterable_by_fields,
other=Database("ecoinvent 3.2 cutoff"),
kind="technosphere",
fields=["reference product", "name", "unit", "location"]
))
sp.statistics()
When I list the remaining unlinked datasets with
bw2io.importers.simapro_csv.SimaProCSVImporter
it outputs e.g.:
Electricity, low voltage {ENTSO-E}| market group for | Alloc Rec, U kilowatt hour ('Electricity/heat',)
Given that I found the dataset in ecoinvent:
'market group for electricity, low voltage' (kilowatt hour, ENTSO-E, None)
How do I link these datasets together?

Answer 1

This is a dataset from ecoinvent 3.2, for which bw2io does not yet have the migration data for the "special" SimaPro names. Normally conversion from Simapro names (e.g. Electricity, low voltage {ENTSO-E}| market group for | Alloc Rec, U) to ecoinvent activity names and reference products would be handled by the migration simapro-ecoinvent-3. But this doesn't work in this case:
In [4]: Migration('simapro-ecoinvent-3').load()['Electricity, low voltage {ENTSO-E}| market group for | Alloc Rec, U']
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
You can write your own migration:
migration_data = {
'fields': ['name'],
'data': [
(
# First element is input data in the order of `fields` above
('Electricity, low voltage {ENTSO-E}| market group for | Alloc Rec, U',),
# Second element is new values
{
'name': 'market group for electricity, low voltage',
'reference product': 'electricity, high voltage',
'location': 'ENTSO-E',
}
)
]
}
Migration("new-ecoinvent").write(
migration_data,
description="New datasets in ecoinvent 3.2"
)
And then apply this migration to your unlinked data:
sp.migrate("new-ecoinvent")
Migration only changes the data used to link; you will still have to apply link_iterable_by_fields to actually link against ecoinvent 3.2.