Robert Bradshaw wrote:
> On Jul 23, 2009, at 11:23 PM, Jason Grout wrote:
>
>> Is it possible to support the any() and all() functions? I'm using
>> the
>> most recent version of Cython in Sage, so forgive me if it is already
>> supported in Cython, but just not in Sage's version yet.
>
> It's working for me...
>
> {{{
> %cython
> print any([0,0,1,0]), all([0,0,1,0])
> ///
> (True, False)
> }}}
>
Not if you use comprehension-like syntax. Can Cython support that in
the same way it supports list/set/dict comprehensions?
Note that in lots of cases, having any/all only support lists kind of
defeats the purpose of the short-cutting.
{{{id=0|
%cython
print all(i>=0 for i in range(10))
print any(i<0 for i in range(10))
///
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/sage/sagenb/sage_notebook/worksheets/jason3/174/code/4.py", line
6, in <module>
_support_.cython_import_all("/home/sage/sagenb/sage_notebook/worksheets/jason3/174/code/sage5.spyx",
globals())
File
"/home/sage/sage_install/sage/local/lib/python2.6/site-packages/sage/server/support.py",
line 411, in cython_import_all
create_local_c_file=create_local_c_file)
File
"/home/sage/sage_install/sage/local/lib/python2.6/site-packages/sage/server/support.py",
line 388, in cython_import
create_local_c_file=create_local_c_file)
File
"/home/sage/sage_install/sage/local/lib/python2.6/site-packages/sage/misc/cython.py",
line 367, in cython
raise RuntimeError, "Error converting %s to C:\n%s\n%s"%(filename,
log, err)
RuntimeError: Error converting
/home/sage/sagenb/sage_notebook/worksheets/jason3/174/code/sage5.spyx to C:
Error converting Pyrex file to C:
------------------------------------------------------------
...
include "interrupt.pxi" # ctrl-c interrupt block support
include "stdsage.pxi" # ctrl-c interrupt block support
include "cdefs.pxi"
print all(i>=0 for i in range(10))
^
------------------------------------------------------------
/home/worksheet/.sage/temp/sagenb/18730/spyx/_home_sage_sagenb_sage_notebook_worksheets_jason3_174_code_sage5_spyx/_home_sage_sagenb_sage_notebook_worksheets_jason3_174_code_sage5_spyx_0.pyx:6:15:
Expected ')'
}}}
{{{id=1|
print all(i>=0 for i in range(10))
print any(i<0 for i in range(10))
///
True
False
}}}
>> I realize that it probably would be easy to write such functions, but
>> since they are standard python functions, it would be nice if they
>> were
>> recognized by Cython. It would be super nice if they were *fast*
>> too :).
>
> This was actually discussed recently, and yes, we'd like to support
> this kind of thing. It shouldn't be too hard to do either. However,
> it's hard to see how one would get faster than the builtin
> implementations of all and any, short of getting rid of the Python call.
Okay. It would be enough for me if it just didn't error out on seeing
any/all with comprehension like syntax. Then I wouldn't have to
obfuscate my code when converting from python.
Thanks!
Jason
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