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Resolve "EXTERN: Slicing a Container returns a List, not a Container"

Summary

Slicing a Container used to return a list instead of a Container (issue #183 (closed), issue #104 on GitLab.com). This is fixed by adding a Container.__getitem__ method.

Focus

Checkout Container.__getitem__ and the corresponding test test_container_slicing in test_container.py.

Test Environment

Regular unittests.

Check List for the Author

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  • All automated tests pass
  • Reference related issues
  • Up-to-date CHANGELOG.md (or not necessary)
  • Up-to-date JSON schema (or not necessary)
  • Appropriate user and developer documentation (or not necessary)
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  • Annotations in code (Gitlab comments)
    • Intent of new code
    • Problems with old code
    • Why this implementation?

Check List for the Reviewer

  • I understand the intent of this MR
  • All automated tests pass
  • Up-to-date CHANGELOG.md (or not necessary)
  • Appropriate user and developer documentation (or not necessary)
  • The test environment setup works and the intended behavior is reproducible in the test environment
  • In-code documentation and comments are up-to-date.
  • Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

Edited by Florian Spreckelsen

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