Fix some warnings from LGTM (#2420)

* fix assignment of a variable to itself

* Fix unnecessary 'else' clause in loop

* formatting and redundant reasignment fix

* mark unreachable code with a TODO comment

* fix variable defined multiple times

* fix static method without static decorator

* revert unintended autoformatting

Co-authored-by: Christian Clauss <[email protected]>

* revert autoformatting issue

* applied black autoformatting

Co-authored-by: Christian Clauss <[email protected]>