rules:
- id: improper-list-concat
  languages:
  - python
  message: >-
    This expression will evaluate to be ONLY value the of the `else` clause if the
    condition `$EXPRESSION`
    is false. If you meant to do list concatenation, put parentheses around the entire
    concatenation expression, like
    this: `['a', 'b', 'c'] + (['d'] if x else ['e'])`. If this is the intended behavior,
    the expression may be confusing to
    others, and you may wish to add parentheses for readability.
  metadata:
    category: maintainability
    technology:
    - python
  pattern: '[...] + [...] if $EXPRESSION else [...]'
  severity: INFO