Support generator expressions in expressions

[cmlenz]

Support for list comprehensions (#12) was added in [93], but we still need to implement support for generator expressions. That's not high priority for now as templates using generator expressions won't be usable on Python 2.3.

[mgood]

Ok, I've got this one.

[mgood]

This was implemented in [248].

[cmlenz]

The test case gives me a “Bus Error” on Python 2.5. Haven't looked into it any further yet.

[cmlenz]

Here's the dissambled bytecode that is generated for the expression:

list(n for n in numbers if n < 2)

The bytecode looks exactly the same for Python 2.4 and Python 2.5b3, but crashes in the latter:

1           0 LOAD_NAME                0 (_lookup_name)
            3 LOAD_NAME                1 (data)
            6 LOAD_CONST               1 ('list')
            9 CALL_FUNCTION            2
           12 LOAD_CONST               2 (<code object <lambda.0> at 0xb9b60, file "<string>", line 1>)
           15 MAKE_FUNCTION            0
           18 LOAD_NAME                0 (_lookup_name)
           21 LOAD_NAME                1 (data)
           24 LOAD_CONST               3 ('numbers')
           27 CALL_FUNCTION            2
           30 GET_ITER            
           31 CALL_FUNCTION            1
           34 CALL_FUNCTION            1
           37 RETURN_VALUE        

[cmlenz]

I've just installed Python 2.5 RC1, and it looks like the bug has been fixed.