Revise `show` for generators and operators

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d2a85e6) 89.0% compared to head (c50cf56) 89.2%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #69 +/- ## ======================================== + Coverage 89.0% 89.2% +0.2% ======================================== Files 28 28 Lines 1931 1965 +34 ======================================== + Hits 1718 1752 +34 Misses 213 213 ```

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