Update examples

This MR updated most of the examples to make sure they're using up to date syntax. I also took the opportunity to enforce flake8 in the examples, so this is now part of the CI testing.

I also added an example which uses non-tensor modes, I'm happy to move this to a separate MR if people think that's better.

approved this merge request

added 6 commits

• f9a0b82c...7c8fe044 - 4 commits from branch master
• 7a033493 - Merge branch 'master' into update_examples
• 195aac95 - pep

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added 1 commit

• ae253791 - pep

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approved this merge request

approved this merge request

added 18 commits

• ae253791...60f7750c - 17 commits from branch master
• 7d8fcd43 - Merge branch 'master' into 'update_examples'

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approved this merge request

approved this merge request

mentioned in commit 4c358a29

merged