[karel-rehor]

Proposed Changes

Replace the function passed to on_error in batches.subscribe with done.set_exception so that the exception will be propagated to the controlling Future.

Currently on_error is simply a call to a print function, so when an exception occurs the Future done never properly ends. When this fails in the check-examples job in the CI pipeline it causes the job to hang until the job's timeout is reached (e.g. 10 min).

With this change, if the example fails during the check-examples check, it will fail faster and the underlying cause will be revealed.

Checklist

• [ ] CHANGELOG.md updated N.A.
• Rebased/mergeable
• [ ] A test has been added if appropriate additional tests not needed
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.54%. Comparing base (1865aca) to head (4581f15).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #735      +/-   ##
==========================================
+ Coverage   90.43%   90.54%   +0.10%     
==========================================
  Files          41       41              
  Lines        3577     3585       +8     
==========================================
+ Hits         3235     3246      +11     
+ Misses        342      339       -3     

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