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

[<bc...@wo...>]

I forgot about the raise statement. Here there are a difference between
CPython and Jython. In Cpython, the first argument (the type) can be
tuple and CPython will then unpack the first value of the tuple as the
type and it will unpack like this repeatedly.

Python 2.1b2 (#12, Mar 23 2001, 14:01:30) [MSC 32 bit (Intel)] on win32
Type "copyright", "credits" or "license" for more information.
>>> raise (((IndexError, 45), 1), 3), 56
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
IndexError: 56
>>>

This tuple unpacking isn't done by Jython where the entire first
expression is used as the exception type:

Jython 2.1a1 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> raise (((IndexError, 45), 1), 3), 56
Traceback (innermost last):
  File "<console>", line 1, in ?
(((<class exceptions.IndexError at 5352464>, 45), 1), 3): 56
>>>

This is a real difference between the python implementations, but there
is AFAICT no ambiguity. The raise statement expect 0, 1, 2 or 3
expressions and the expressions can *not* be replaced by a 0, 1, 2 or
3-tuple.

regards,
finn