On Thu, Jan 20, 2011 at 2:05 PM, Bruce Leban <bruce@leapyear.org> wrote:

On Thu, Jan 20, 2011 at 11:47 AM, Tim Delaney <timothy.c.delaney@gmail.com> wrote:

['b':1] would then be ambiguous (appears to be a slice of a list). More obvious in the case of [1:2] ...

We use parenthesis for tuples and avoid the ambiguity by writing (1,).
In the same way, we could require your examples to be written ['b':1,] and [1:2,]

Please, not this.  I like the idea of syntactic support for the odict, but no need to spread the (foo,) syntax around.  It's too easy to misinterpret when you do a quick scan of a body of code.