Validating documents with etree.XMLSchema

[lmar76]

According to the documentation it is possible to validate an ElementTree object against an XML schema using etree.XMLSchema.validate() method or using it as a callable. In both cases, mypy traces an error. E.g.:

import sys

from lxml import etree


def main() -> None:
    try:
        schema_file = sys.argv[1]
        file = sys.argv[2]
    except IndexError:
        sys.exit("Missing argument(s)")

    schema = etree.XMLSchema(etree.parse(schema_file))
    doc = etree.parse(file)

    if schema(doc):
        print(f"{file} is valid")
    else:
        print(f"{file} is not valid")

    if schema.validate(doc):
        print(f"{file} is valid")
    else:
        print(f"{file} is not valid")


if __name__ == '__main__':
    main()

% mypy main.py     
main.py:16: error: "XMLSchema" not callable
main.py:21: error: "XMLSchema" has no attribute "validate"