[Python-ideas] Non-boolean return from __contains__

[Greg Ewing]

Chris Rebert wrote:

> In other words, you want (possibly an implicit form of) the comma
> operator from Scheme's quasiquote.

I thought about that, but I'd rather avoid having to
expicitly mark the sub-expressions if possible.

The way I envisage it, each of the AST nodes would
have an eval() method which would evaluate it in the
calling environment. It would be up to the consumer
of the AST to decide when to call it.

-- 
Greg