How to get multiple errors validating XML file with Python libraries?

user_1541011 0
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I have some XML file i want to validate and i have to do it with Python. I've tryed to validate it with XSD with lxml. But i get only one error which occurs first but i need all errors and mismatches in XML file. Is there any method how i can manage to get list of all errors with lxml? Or are there any other Python solutions?

lxml validation error-handling xml python
6 Answers

Using XMLSchema library you can resort to the iter_errors method: https://xmlschema.readthedocs.io/en/latest/api.html?highlight=iter_errors#xmlschema.XMLSchemaBase.iter_errors

here my code (Python 3):

def get_validation_errors(xml_file, xsd_uri='example.xsd'):
    xml_string = xml_file.read().decode('utf-8')
    dir_path = os.path.dirname(os.path.realpath(__file__))
    xsd_path = os.path.join(dir_path, xsd_uri)
    schema = xmlschema.XMLSchema(xsd_path)
    validation_error_iterator = schema.iter_errors(xml_string)
    for idx, validation_error in enumerate(validation_error_iterator, start=1):
        print(f'[{idx}] path: {validation_error.path} | reason: {validation_error.reason}')
user_1643740

With lxml, you can iterate over error_log and print line number and error message for each error:

def validate_with_lxml(xsd_tree, xml_tree):
    schema = lxml.etree.XMLSchema(xsd_tree)
    try:
        schema.assertValid(xml_tree)
    except lxml.etree.DocumentInvalid:
        print("Validation error(s):")
        for error in schema.error_log:
            print("  Line {}: {}".format(error.line, error.message))
user_4420060

The solution provided doesn't work anymore due to several errors. Before applying assertValid on xmlschema, you have to specify it as follows:

try:
   xmlschema_doc = lxml.etree.parse(filename)
   xmlschema = lxml.etree.XMLSchema(xmlschema_doc)
   xmlschema.assertValid(elem_tree)
except lxml.etree.ParseError as e:
   raise lxml.etree.ParserError(str(e))
except lxml.etree.DocumentInvalid as e:
   if ignore_errors:
    raise lxml.etree.ValidationError("The Config tree is invalid with error 
       message:\n\n" + str(e))
user_51597400 
def get_validation_errors(xml_file, xsd_file):
    schema = xmlschema.XMLSchema(xsd_file)
    validation_error_iterator = schema.iter_errors(xml_file)
    errors = list()
    for idx, validation_error in enumerate(validation_error_iterator, start=1):
        errors.append(validation_error.__str__())
        print(
            f'[{idx}] path: {validation_error.path} | reason: {validation_error.reason} | message: {validation_error.message}')
    return errors
user_28683670
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