Python

pip install gaebboss

gaebboss.Document(path) or gaebboss.Document(data=bytes, name="x.X83") parses with the GIL released; data takes bytes, bytearray, memoryview or any other buffer and copies it once. Everything it returns is a plain object: items(), categories(), markup_items(), boq, project, warnings, validate(), validate_against(tender), to_json(), write(...) and write_report(...). Every GAEB number is a decimal.Decimal built from its exact text; passing a float to a bid raises GaebError.

from decimal import Decimal
import gaebboss

tender = gaebboss.Document("tender.X83")
bid = gaebboss.Bid.from_tender(tender, {"name1": "Bau GmbH", "street": "Weg 1", "pcode": "12345", "city": "Berlin"})
for item in tender.items():
    if item.kind == "FreeQuantity":
        bid.free_quantity(item.id, Decimal("10.000"))
    bid.price(item.id, Decimal("12.50"))
bid.vat_percent(Decimal("19"))
doc = bid.finish()
assert [f for f in doc.validate() if f.severity == "Error"] == []
open("bid.X84", "wb").write(doc.write())

Documents are immutable and can be shared between threads; parsing sixteen copies in a thread pool scales with cores. Reading a file, items(), validate(), validate_against(), write(), write_report(), to_json(), Bid.from_tender() and Bid.finish() all run with the GIL released, so other Python threads keep running meanwhile. Item decimals become decimal.Decimal when the attribute is read.