CSS Filter "AttributeError: 'CSSSelector' object has no attribute 'evaluate'"

[jamesquilty]

I have urlwatch running on an Arch Linux server for which I'm not sysadmin. An update/upgrade was applied over the weekend of 13-14 Jan which has caused jobs with CSS filters to generate tracebacks

Traceback (most recent call last):
  File "/home/username/.local/lib/python3.10/site-packages/urlwatch/handler.py", line 120, in process
    data = FilterBase.process(filter_kind, subfilter, self, data)
  File "/home/username/.local/lib/python3.10/site-packages/urlwatch/filters.py", line 188, in process
    return filtercls(state.job, state).filter(data, subfilter)
  File "/home/username/.local/lib/python3.10/site-packages/urlwatch/filters.py", line 810, in filter
    return lxml_parser.get_filtered_data()
  File "/home/username/.local/lib/python3.10/site-packages/urlwatch/filters.py", line 776, in get_filtered_data
    elements = list(self._get_filtered_elements())
  File "/home/username/.local/lib/python3.10/site-packages/urlwatch/filters.py", line 764, in _get_filtered_elements
    namespaces=self.namespaces).evaluate(root)
AttributeError: 'CSSSelector' object has no attribute 'evaluate'

I've tried a force reinstall to resolve the problems, to no avail. The versions of urlwatch and lxml which provides the CSSSelector class are

• urlwatch 2.28
• lxml 5.1.0

urlwatch is installed locally with the --user flag, which also installs lxml and other dependencies locally, as I don't have write access to the system.

The sysadmins tell me that they tried running urlwatch on an Ubuntu box and received the same errors.

[bermeitinger-b]

The problem was introduced in lxml 5. You can install 4.9.4 (pip install -U "lxml<5") until the maintainers have time to migrate.

[jamesquilty]

Thanks, that resolves the problem.

FWIW, how the problem occurred was the original install relied on the system-installed lxml and the system upgrade upgraded lxml to version 5.0.0. On reinstall of urlwatch with --user, the latest lxml, version 5.1.0, was installed locally.