a snapcraft that just install trigger-happy

snapcraft.yaml

name: trigger-happy
version: master
summary: An opensource clone of IFTTT.com, a bridge between your internet services
description: Trigger Happy is a system for building triggers to automate tasks
 from your online services like Tiwtter, Evernote, Wallabag, etc
confinement: strict

parts:
  trigger-happy-source:
    plugin: python
    source: git://github.com/foxmask/django-th.git
    source-tag: master
    requirements: ./requirements.txt
    build-packages:
      - libtidy-0.99-0
      - pandoc

snapcraft2.yaml

name: trigger-happy
version: master
summary: An opensource clone of IFTTT.com, a bridge between your internet services
description: Trigger Happy is a system for building triggers to automate tasks
 from your online services like Tiwtter, Evernote, Wallabag, etc
confinement: strict

apps:
  trigger-happy:
    command: python manage.py runserver 0.0.0.0:8090
    plugs:
      - network

parts:
  trigger-happy-source:
    plugin: python
    source: git://github.com/foxmask/django-th.git
    source-tag: master
    requirements: ./requirements.txt
    build-packages:
      - libtidy-0.99-0
      - pandoc

1rst one is ok (project is installed) but launches nothing

2nd one fails with

The specified command 'python' defined in the app 'trigger-happy' does not exist or is not executable

Look in /snap/trigger-happy/current/ to see what should be in command: .