Consolidate LCIA methods for multiple database versions

consolidated_method.py

import bw2io as bi
import bw2data as bd
import bw2calc as bc

impact_category_39 = (
    'ecoinvent-3.9.1',
    'ReCiPe 2016 v1.03, endpoint (E) no LT',
    'total: natural resources no LT',
    'natural resources no LT'
)
impact_category_310 = (
    'ecoinvent-3.10.1',
    'ReCiPe 2016 v1.03, endpoint (E) no LT',
    'total: natural resources no LT',
    'natural resources no LT'
)

assert impact_category_39 in bd.methods
assert impact_category_310 in bd.methods

consolidated_method = bd.Method((
    'consolidated-3.9.1-3.10.1',
    'ReCiPe 2016 v1.03, endpoint (E) no LT',
    'total: natural resources no LT',
    'natural resources no LT'
))
consolidated_method.register(
    unit=bd.Method(impact_category_39).metadata['unit'],
)
consolidated_method.write(
    bd.Method(impact_category_39).load() + bd.Method(impact_category_310).load()
)