Sprinters example: updated CustomJS; some PEP8 cleanup (#11438)
Sprinters example: updated CustomJS; some PEP8 cleanup (#11438)

* updated CustomJS; some PEP8 cleanup

* differentiate outer and inner 'medal' vars

* Update package-lock.json

* Update examples/plotting/file/sprint.py

Co-authored-by: Bryan Van de Ven <0a3ba1af216659500dd8f41e29f3979f42452870@bokeh.org>

* fixes round 1

* removing unused imports

* fixing isort issue

* fixes round 2

* fixing another isort issue

Co-authored-by: carolyn <bd8e5bb6f9a76b6ad22c4395032382453fde0f17@bokeh.org>
Co-authored-by: Bryan Van de Ven <0a3ba1af216659500dd8f41e29f3979f42452870@bokeh.org>
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