On Mon, Oct 6, 2008 at 7:04 PM, Robert Bradshaw
<[EMAIL PROTECTED]> wrote:
> On Oct 5, 2008, at 3:46 PM, Ondrej Certik wrote:
>
>> On Sat, Oct 4, 2008 at 1:42 PM, Robert Bradshaw
>> <[EMAIL PROTECTED]> wrote:
>>> I polished off some more of the pure python mode stuff tonight. I
>>> just pushed it to cython-devel. Now you can do stuff like:
>>>
>>>> import cython # you need a single file to be in your path to use
>>>> it in pure Python mode, provided (and installed) with Cython
>>>>
>>>> @cython.locals(x=int, y=cython.p_int)
>>>> def foo(x):
>>>> y = cython.cast(cython.p_int, x)
>>>> print x + cython.sizeof(y) + cython.sizeof(cython.p_int)
>>>> if cython.compiled:
>>>> print "the compiler was run
>>>> else:
>>>> print "just being interpreted"
>>>>
>>>> x = cython.declare(int)
>>>> xx = cython.declare(cython.p_int)
>>>> xx = cython.address(x)
>>>>
>>>> MyStruct = cython.struct(x=int, y=int, data=cython.pp_double)
>>>>
>>>> a = cython.declare(MyStruct)
>>>> a.x = 5
>>>>
>>>> T = cython.typedef(MyStruct)
>>>> b = cython.declare(cython.pointer(T))
>>>> b[0].x = 4
>>>
>>>
>>> On top of this, you can write a .pxd file to accompany your .py file
>>> and it will coerce your .py file classes and def statements into cdef
>>> and cpdef versions.
>>>
>>> It's still very new and probably highly experimental (though it only
>>> modifies the cython.* nodes, so it shouldn't cause any regressions).
>>> Let me know what you think.
>>
>> Thanks a lot for doing this!
>
> You're welcome.
>
>> I installed cython-devel and then I tried this little example:
>>
>>
>> --------
>> import Cython as cython
>>
>> @cython.locals(x=int, y=cython.p_int)
>> def foo(x):
>> y = cython.cast(cython.p_int, x)
>> print x + cython.sizeof(y) + cython.sizeof(cython.p_int)
>> if cython.compiled:
>> print "the compiler was run"
>> else:
>> print "just being interpreted"
>>
>> foo(5)
>> -----------
>>
>> When running in it in Python, it gives:
>>
>> File "t.py", line 12, in <module>
>> foo(5)
>> File "t.py", line 5, in foo
>> y = cython.cast(cython.p_int, x)
>> File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 14, in cast
>> return type(arg)
>> File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 53, in
>> __init__
>> raise ValueError
>> ValueError
>>
>>
>> Am I using it incorrectly?
>
> No, it's just not letting you cast an int into an p_int. I suppose it
> should? It just doesn't make sense to emulate this in Python.
No, you are right, I was just trying to get it run.
>
>> Btw, when I compile it with Cython:
>>
>> $ python -c "import t; t.foo(5)"
>> Traceback (most recent call last):
>> File "<string>", line 1, in <module>
>> File "t.py", line 12, in t (t.c:515)
>> foo(5)
>> File "t.py", line 5, in t.foo (t.c:265)
>> y = cython.cast(cython.p_int, x)
>> File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 14, in cast
>> return type(arg)
>> File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 53, in
>> __init__
>> raise ValueError
>> ValueError
>
> You need to import cython, not import Cython as cython.
>
>> Looking at the code, I need to pass it Cython p_int integers, right? I
>> also tried:
>>
>> x = cython.declare(int)
>> xx = cython.declare(cython.p_int)
>> xx = cython.address(x)
>> foo(xx)
>>
>> But this also raises the same error as above.
>
> This should work, Again, I think it's because you imported Cython
> rather than cython.
I tried that too:
[EMAIL PROTECTED]:~/ext/cython-pure$ cat t.py
import cython
@cython.locals(x=int, y=cython.p_int)
def foo(x):
y = cython.cast(cython.p_int, x)
print x + cython.sizeof(y) + cython.sizeof(cython.p_int)
if cython.compiled:
print "the compiler was run"
else:
print "just being interpreted"
#foo(5)
x = cython.declare(int)
xx = cython.declare(cython.p_int)
xx = cython.address(x)
foo(xx)
[EMAIL PROTECTED]:~/ext/cython-pure$ python t.py
Traceback (most recent call last):
File "t.py", line 17, in <module>
foo(xx)
File "t.py", line 5, in foo
y = cython.cast(cython.p_int, x)
File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 14, in cast
return type(arg)
File "/home/ondra/lib/lib/python/Cython/Shadow.py", line 53, in __init__
raise ValueError
ValueError
With the same output. I copied the cython.py from cython-devel, is
that correct? I am probably doing something stupid. The error is
really simple and it fails, but currently I am not sure what it is
supposed to do correctly.
Ondrej
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