Funny thing... the other day I tried converting some Lisp to Python as a demonstration, and discovered that the number of parens you get to remove depends largely on the programming style you're using. Mostly, they just get shifted around or replaced with brackets (or braces), and you have to add a lot of commas.

If you scan over http://norvig.com/python-lisp.html, you'll see a lot of opportunities to remove parens; but in fact many of those are not semantically identical.

In python, a block does not return a value.

    if a:f(x);else:g(y)

If you wanted it to return a value, you'd have to rewrite 'if' as a function and say something like:

     myif(a, [(f, x)], [(g, y)])

If you wanted to evolve python towards Lisp without having to add parens, I'd make it so indented blocks are actually expressions and automatically return a value to the defining block.

(Of course, the normal python way is to use "return" statements or side-effects, rather than writing an ad-hoc version of the lisp 'if')