ImportError: No module named six

Thanks for the suggestions. I went for this which works, but looks inelegant to me. Any suggestions for improvements?

name: offlineimap
version: 'master'
summary: OfflineIMAP
description: |
  Read/sync your IMAP mailboxes

grade: stable
confinement: strict

apps:
  offlineimap:
    command: bin/offlineimap
    plugs:
      - network

parts:
  setup:
    plugin: python
    python-version: python2
    python-packages: [six]
  offlineimap:
    after: [setup]
    plugin: python
    python-version: python2
    source: https://github.com/OfflineIMAP/offlineimap.git
    build-packages:
      - gcc
      - g++
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