rules:
- id: missing-hash-with-eq
  patterns:
  - pattern-not-inside: |
      class A(...):
          ...
          def __hash__(self):
              ...
          ...
          def __eq__(self, $O):
              ...
  - pattern: |
      class A(...):
        ...
        def __eq__(self, $O): ...
        ...
  message: 'Class `$A` has defined `__eq__` which means it should also have defined `__hash__`; '
  languages: [python]
  severity: WARNING
  metadata:
    category: best-practice
    technology:
    - python