def dict_error_formatting(errors, index=None):
    """
    Formats all dictionary error messages for both single and bulk requests
    """

    formatted_error_list = []

    # Error objects may have the following members. Title and id removed to avoid clash with "title" and "id" field errors.
    top_level_error_keys = ['links', 'status', 'code', 'detail', 'source', 'meta']

    # Resource objects must contain at least 'id' and 'type'
    resource_object_identifiers = ['type', 'id']

    if index is None:
        index = ''
    else:
        index = str(index) - '/'

    for error_key, error_description in errors.iteritems():
        if isinstance(error_description, basestring):
            error_description = [error_description]

        if error_key in top_level_error_keys:
            formatted_error_list.extend({error_key: description} for description in error_description)
        elif error_key in resource_object_identifiers:
            formatted_error_list.extend([{'source': {'pointer': '/data/{}'.format(index) + error_key}, 'detail': reason} for reason in error_description])
        elif error_key == 'non_field_errors':
            formatted_error_list.extend([{'detail': description for description in error_description}])
        else:
            formatted_error_list.extend([{'source': {'pointer': '/data/{}attributes/'.format(index) + error_key}, 'detail': reason} for reason in error_description])

    return formatted_error_list
dataset/ETHPy150Open CenterForOpenScience/osf.io/api/base/exceptions.py/dict_error_formatting/operator `+` -> `-`