Ipykernel

Enhancements made

- Implemented `richInspectVariable` request handler [734](https://github.com/ipython/ipykernel/pull/734) ([JohanMabille](https://github.com/JohanMabille))

Maintenance and upkeep improvements

- Bump `importlib-metadata` limit for `python<3.8` [738](https://github.com/ipython/ipykernel/pull/738) ([ltalirz](https://github.com/ltalirz))

Bug Fixes

- Fix exception raised by `OutStream.write` [726](https://github.com/ipython/ipykernel/pull/726) ([SimonKrughoff](https://github.com/SimonKrughoff))

- `KernelApp`: rename ports variable to avoid override [731](https://github.com/ipython/ipykernel/pull/731) ([amorenoz](https://github.com/amorenoz))

Bugs fixed

- Add watchfd keyword to InProcessKernel OutStream initialization [727](https://github.com/ipython/ipykernel/pull/727) ([rayosborn](https://github.com/rayosborn))
- Fix typo in eventloops.py [711](https://github.com/ipython/ipykernel/pull/711) ([selasley](https://github.com/selasley))
- \[bugfix\] fix in setup.py (comma before appnope) [709](https://github.com/ipython/ipykernel/pull/709) ([jstriebel](https://github.com/jstriebel))

Maintenance and upkeep improvements

- Add upper bound to dependency versions. [714](https://github.com/ipython/ipykernel/pull/714) ([martinRenou](https://github.com/martinRenou))
- Replace non-existing function. [723](https://github.com/ipython/ipykernel/pull/723) ([Carreau](https://github.com/Carreau))
- Remove unused variables [722](https://github.com/ipython/ipykernel/pull/722) ([Carreau](https://github.com/Carreau))
- Do not use bare except [721](https://github.com/ipython/ipykernel/pull/721) ([Carreau](https://github.com/Carreau))
- misc whitespace and line too long [720](https://github.com/ipython/ipykernel/pull/720) ([Carreau](https://github.com/Carreau))
- Formatting: remove semicolon [719](https://github.com/ipython/ipykernel/pull/719) ([Carreau](https://github.com/Carreau))
- Clean most flake8 unused import warnings. [718](https://github.com/ipython/ipykernel/pull/718) ([Carreau](https://github.com/Carreau))
- Minimal flake8 config [717](https://github.com/ipython/ipykernel/pull/717) ([Carreau](https://github.com/Carreau))
- Remove CachingCompiler's filename_mapper [710](https://github.com/ipython/ipykernel/pull/710) ([martinRenou](https://github.com/martinRenou))

- Fix Tk and asyncio event loops [704](https://github.com/ipython/ipykernel/pull/704) ([ccordoba12](https://github.com/ccordoba12))
- Stringify variables that are not json serializable in inspectVariable [702](https://github.com/ipython/ipykernel/pull/702) ([JohanMabille](https://github.com/JohanMabille))

- `ipykernel.codeutils` was deprecated since 4.x series (2016) and has been removed, please import similar
functionalities from `ipyparallel`
- remove `find_connection_file` and `profile` argument of `connect_qtconsole` and `get_connection_info`, deprecated since IPykernel 4.2.2 (2016).

Contributors to this release

([GitHub contributors page for this release](https://github.com/ipython/ipykernel/graphs/contributors?from=2021-01-11&to=2021-06-29&type=c))

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