GitLab

* added f-string

* fix missing parentheses and other string formatting

* remove extra trailing parenthesis

* one more missing parenthesis

* fix pandas categoricals

* update uses of +

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>