py3 use py3 compatible syntax for zip in doctests

[chapoton]

wrapping with list where necessary

part of #16082

[chapoton]

New commits:

​a571da7

futurize some zips in the doctests

[jmantysalo]

Does not work, because there is a line list = [] in src/sage/plot/plot3d/implicit_surface.pyx.

[jmantysalo]

Btw, list=[1,2,3,4,5] on src/sage/misc/functional.py should be changed too. Found by

egrep 'sage:.+[^a-z_0-9A-Z.]list ?=' src/sage -R

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​8fd6531

trac 21568 do not overwrite the reserved word "list"

[chapoton]

Done. Thank you, Jori, for all your helpful work.

[jmantysalo]

Replying to chapoton:

Done. Thank you, Jori, for all your helpful work.

You have done much more, so thanks to you.

Works now. I suppose you forgot to mark this as needs review, and mark this as positive review.