( cpp4py-v2 8.3) Different context

[verony1075]

The context in this section is different from the other book.

[verony1075]

working on this

[coco3427]

@pearcej this appears to be out of date, the pretext version is better now and more polished

[pearcej]

@coco3427 Does the rst version need updating?

[coco3427]

@pearcej the pretext version appears to be more up to date, so the restructured text should be updated