[Python-3000] removing destructuring del

[Andrew Dalke]

For lack of a better term, I'll call this a destructuring del

    del (a, (b, (c)))

I propose that it should not be valid in Python 3.

It's supported in 2.x and 3.0a2.  It's never caused anyone problems.   
No one (that I can find through 10 minutes of grepping) uses it.   
When I figured out that I could do it, by looking at the grammar, I  
didn't believe it was valid.  I still can't figure out why anyone  
would use it.

Python 3 removes support for destructuring in function calls

def f((a,b)):  # SyntaxError in Python3
    pass

and I think this falls into the same category.

I would even argue that

    del(x)

should not be allowed because it's suggests and is likely based on  
the false belief that 'del' is a function call.  But I'm not  
proposing getting rid of return(x).


				Andrew
				dalke at dalkescientific.com