Travis Python 2.7 environment has a version of attrs pre-installed which is not compatible with the latest Twisted. When txkube is installed with pip, the old version is left in place because pip doesn't do an upgrade by default. Then, the build fails.
Travis Python 2.7 environment has a version of attrs pre-installed which is not compatible with the latest Twisted. When txkube is installed with pip, the old version is left in place because pip doesn't do an upgrade by default. Then, the build fails.