[Python-3000] Allowing slice syntax in more places

[Travis E. Oliphant]

I'm sorry if this has been discussed before.

One of the things that is really nice about slice syntax is the ability 
to construct slice objects to pass to __getitem__  using []

Would it be possible to extend the syntax so that slice syntax is 
acceptable in more places in Python?  In particular function calls would 
be a very useful addition.  Thus,

myfunc(3:4:0.5, 1:5)

would produce the equivalent bytecode as

myfunc(slice(3,4,0.5), slice(1,5))


-Travis