vdirsyncer > 0.13.0 does not support python 2 anymore. https://github.com/pimutils/vdirsyncer/blob/master/CHANGELOG.rst#version-0130
vdirsyncer > 0.13.0 does not support python 2 anymore. https://github.com/pimutils/vdirsyncer/blob/master/CHANGELOG.rst#version-0130