Re: [Jython-users] Re: assert/raise syntax ambiguity ?

[D-Man <ds...@ri...>]

On Thu, Mar 29, 2001 at 06:01:55PM +0000, Finn Bock wrote:
| [assert/raise on tuples or on exprs]
| 
| I can't quite find head or tail in this discussion, but I think that the
| conclusions are wrong.

I think you got it all ;-).

| The "assert" statement allow for one or for two expresion as arguments.
| You are allow to make that single expresion a 2-tuple, but I bet that it
| doesn't do what you wanted it to do:
| 
...
| >>> assert 0, "message"
| Traceback (innermost last):
|   File "<console>", line 1, in ?
| AssertionError: message
| >>> assert (0, "message")
| >>>
| 
| Notice that the last assert didn't throw an AssertionError and it never
| will.

Hmm, oops.  Thanks!

| I'll also like to set straight that there are IMO *not* any conflict in
| the grammar or language def about the optional comma in the assert
| statement and the tuple creating comma in the atom production.

Given that last example, there no longer seems to be a conflict.  I
was mistakenly thinking that

assert ( expr , "message" )

was identical to

assert expr , "message"


which led to the confusion with the documentation.

-D