From vitja.makarov at gmail.com  Wed Mar  2 22:07:25 2011
From: vitja.makarov at gmail.com (Vitja Makarov)
Date: Thu, 3 Mar 2011 00:07:25 +0300
Subject: [Cython] strange bug in starred target
Message-ID: <AANLkTik3TVBeBw1VGxGcAF4MyRk7feFxjTepFh-4=p3w@mail.gmail.com>

This doesn't work:
def assign():
    a, *b = 1,2,3,4,5
    return a, b

>>> import x
>>> x.assign()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "x.pyx", line 6, in x.assign (x.c:445)
    a, *b = 1,2,3,4,5
TypeError: Expected list, got int

And this is ok:

def assign():
    a, *b = 1,2,3,4,5
    return a, b
    *a, b = 1,2,3,4,5
    return a, b

>>> import x
>>> x.assign()
(1, [2, 3, 4, 5])



-- 
vitja.

From vitja.makarov at gmail.com  Wed Mar  2 22:27:20 2011
From: vitja.makarov at gmail.com (Vitja Makarov)
Date: Thu, 3 Mar 2011 00:27:20 +0300
Subject: [Cython] strange bug in starred target
In-Reply-To: <AANLkTik3TVBeBw1VGxGcAF4MyRk7feFxjTepFh-4=p3w@mail.gmail.com>
References: <AANLkTik3TVBeBw1VGxGcAF4MyRk7feFxjTepFh-4=p3w@mail.gmail.com>
Message-ID: <AANLkTi=veponWWA0MP0w-uYFBzDfuS=Aeat462yJzi-p@mail.gmail.com>

2011/3/3 Vitja Makarov <vitja.makarov at gmail.com>:
> This doesn't work:
> def assign():
> ? ?a, *b = 1,2,3,4,5
> ? ?return a, b
>
>>>> import x
>>>> x.assign()
> Traceback (most recent call last):
> ?File "<stdin>", line 1, in <module>
> ?File "x.pyx", line 6, in x.assign (x.c:445)
> ? ?a, *b = 1,2,3,4,5
> TypeError: Expected list, got int
>
> And this is ok:
>
> def assign():
> ? ?a, *b = 1,2,3,4,5
> ? ?return a, b
> ? ?*a, b = 1,2,3,4,5
> ? ?return a, b
>
>>>> import x
>>>> x.assign()
> (1, [2, 3, 4, 5])
>
>

I hope problem is somewhere in map_starred_assignment()

-- 
vitja.

From vitja.makarov at gmail.com  Thu Mar  3 20:44:34 2011
From: vitja.makarov at gmail.com (Vitja Makarov)
Date: Thu, 3 Mar 2011 22:44:34 +0300
Subject: [Cython] strange bug in starred target
In-Reply-To: <AANLkTi=veponWWA0MP0w-uYFBzDfuS=Aeat462yJzi-p@mail.gmail.com>
References: <AANLkTik3TVBeBw1VGxGcAF4MyRk7feFxjTepFh-4=p3w@mail.gmail.com>
	<AANLkTi=veponWWA0MP0w-uYFBzDfuS=Aeat462yJzi-p@mail.gmail.com>
Message-ID: <AANLkTikfsLfgAE0aC6Ey0sMvCAKRzxHpBCLDmTWSwZma@mail.gmail.com>

2011/3/3 Vitja Makarov <vitja.makarov at gmail.com>:
> 2011/3/3 Vitja Makarov <vitja.makarov at gmail.com>:
>> This doesn't work:
>> def assign():
>> ? ?a, *b = 1,2,3,4,5
>> ? ?return a, b
>>
>>>>> import x
>>>>> x.assign()
>> Traceback (most recent call last):
>> ?File "<stdin>", line 1, in <module>
>> ?File "x.pyx", line 6, in x.assign (x.c:445)
>> ? ?a, *b = 1,2,3,4,5
>> TypeError: Expected list, got int
>>
>> And this is ok:
>>
>> def assign():
>> ? ?a, *b = 1,2,3,4,5
>> ? ?return a, b
>> ? ?*a, b = 1,2,3,4,5
>> ? ?return a, b
>>
>>>>> import x
>>>>> x.assign()
>> (1, [2, 3, 4, 5])
>>
>>
>
> I hope problem is somewhere in map_starred_assignment()
>

That wasn't as simple as patch is...

Ticket on trac http://trac.cython.org/cython_trac/ticket/664
Pull request https://github.com/cython/cython/pull/7

-- 
vitja.

From anders at embl.de  Tue Mar 22 15:21:30 2011
From: anders at embl.de (Simon Anders)
Date: Tue, 22 Mar 2011 15:21:30 +0100
Subject: [Cython] cython crash: default parameters in methods of template
	cppclass
Message-ID: <4D88B06A.5010802@embl.de>

Hi,

I found a little bug in Cython 0.14.1.

The following causes the Cython compiler to throw an exception:

---8<---
cdef extern from "foo.h":
    cdef cppclass foo[ T ]:
       bar( int b = 0 )

cdef foo[ int ] a
a.bar( 1 )
---8<---

The exception is "AttributeError: 'CFuncType' object has no attribute 
'op_arg_struct'", thrown in line 3044, in generate_result_code. Full 
stack trace attached.

The file compiles without crash if one either
  - removes the last line, i.e. the call to the class's method, or
  - removes the template argument, i.e., the "[ T ]" in line 2 and
       the "[ int ]" in line 5.

Hence, the issue only appears when calling methods of _templated_ 
classes, which have a _default_ value for their argument.


   Simon


+---
| Dr. Simon Anders, Dipl.-Phys.
| European Molecular Biology Laboratory (EMBL), Heidelberg
| office phone +49-6221-387-8632
| preferred (permanent) e-mail: sanders at fs.tum.de
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From wstein at gmail.com  Wed Mar 23 02:21:38 2011
From: wstein at gmail.com (William Stein)
Date: Tue, 22 Mar 2011 18:21:38 -0700
Subject: [Cython] cython talk by Robert Bradshaw
Message-ID: <AANLkTim_havroXaxov3OXpBMpxTLLC=T3BepK_KWcmN3@mail.gmail.com>

Hi,

Robert Bradshaw gave a talk on Cython today at Sage Days 29:

  Youtube Video:  http://www.youtube.com/watch?v=osjSS2Rrvm0

  Slides:  http://wiki.sagemath.org/days29?action=AttachFile&do=view&target=cython-days29.pdf

-- 
William Stein
Professor of Mathematics
University of Washington
http://wstein.org