Fix flake8 issues since release 3.6.0 Flake8 had a new release which raise new issues, namely: W504: line break after binary operator F841: local variable 'ex' is assigned to but never used W605: invalid escape sequence F821: undefined name 'buffer' (noqa seems the only way to avoid this false positive) Also pin flake8>=3.6 in our tests and make explicit that we use python3 to run flake8 tests.

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from cubicweb.predicates import is_instance

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from cubicweb.hooks import notification

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class FolderUpdateHook(notification.EntityUpdateHook):

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    __select__ = (notification.EntityUpdateHook.__select__

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                  & is_instance('Folder'))

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    order = 100  # late trigger so that metadata hooks come before.