Block append / prepend template tags

[Jonathan Buchanan]

Add {% append %} and {% prepend %} tags which act the same as {% block %} in a child template, but which implicitly insert {{ block.super }} before or after the child template's block contents, respectively.

I've ​made use of this feature in Jade and found it nice for blocks which often collect content as they go down the inheritance chain, like script blocks in <head> and before <body>.

It's not so much that having to use {{ block.super }} is annoying or tiresome in any way, but having used them elsewhere, the semantics of append/prepend tags just feel nice in templates.

[Harris Lapiroff]

My feeling is that it's not necessary to have two ways of appending and prepending content to a block. People who really want that sort of thing can use third-party apps like django-sekizai.

[Aymeric Augustin]

Indeed, per the Zen of Python "There should be one-- and preferably only one --obvious way to do it."

Django's current implementation is very explicit and only slightly more verbose. With your proposal, it isn't clear if the appending/prepending happens from the outer to the inner block, or the other way round.

You can still implement these custom tags in your applications if you like them.