exception message output problem

[Mel]

Lie wrote:
> PPS: Actually, what makes a tuple is both the parens and the comma,
> with comma as the minimum signifier, inspect this: "str(a) +
> str((a,b,c))", you have to use the double parens, one to make the
> tuple and the other as part of the str. This harmless little case
> gives error if done without the double parens, but what would happen
> if we exchange the str into a function that accepts one argument and
> several optional arguments (or better yet, one argument and an
> optional * argument)?

I think the effect there is operator precedence.  In

str(a,b,c)

the function-calling operator () takes over, and the commas are 
considered as argument separators.  In

str ((a,b,c))

the inner parens present a single tuple-expression to the 
function-calling operator.

Just like  a+b/c  as against  (a+b)/c  but with esoteric overloading 
of ( ) and , .


	Mel.