Re: [sage-devel] Re: embedding sage in c or c++

[Jan Groenewald]

Hi

I missed the rest of this thread, but...

On Sat, 29 Sep 2018 at 13:24,  wrote:

>
> Our Sage version is 8.2. We are getting this error.
>
> abc@Math-Sans:~/Downloads/SageMath$ sage --python
>

Use

./sage --python

where the ./ indicates the sage command is in that folder you are located
in.

For convenience, you can make sage an alias with

echo '/home/abc/Downloads/SageMath/sage' | tee -a /home/abc/.bashrc ;
source /home/abc/.bashrc

You can then just type sage in any folder.

Regards,
Jan



-- 
  .~.
  /V\ Jan Groenewald
 /( )\www.aims.ac.za
 ^^-^^

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Re: [sage-devel] Re: embedding sage in c or c++

[memalaysarkar]

Our Sage version is 8.2. We are getting this error.

abc@Math-Sans:~/Downloads/SageMath$ sage --python
No command 'sage' found, did you mean:
 Command 'page' from package 'tcllib' (universe)
 Command 'save' from package 'atfs' (universe)
 Command 'osage' from package 'graphviz' (main)
sage: command not found

Also

abc@Math-Sans:~/Downloads/SageMath$ python
Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> sage --python
Traceback (most recent call last):
  File "", line 1, in 
NameError: name 'sage' is not defined
>>>




On Friday, September 28, 2018 at 11:36:42 PM UTC+5:30, Dima Pasechnik wrote:
>
>
>
> On Fri, 28 Sep 2018, 18:36 Abhishek Kesarwani, <1907...@gmail.com 
> > wrote:
>
>> Thank you, sir, for replying.  I tried to run it again after Installing
>> Sage python2, it gives the following error. 
>>
>
> What version of Sagemath have you installed?
> Are you able to start Python by running
>
> sage --python
>
>
>
>> 1+1000:
>> 1001
>> Load sage 
>> Traceback (most recent call last):
>>   File "", line 1, in 
>> ImportError: No module named all
>> abc@Math-Sans:~/Downloads/SageMath$ python 
>> Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
>> [GCC 5.4.0 20160609] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>>  from sage.all import * 
>>   File "", line 1
>> from sage.all import * 
>> ^
>> IndentationError: unexpected indent
>> >>>
>>
>> On Thursday, September 27, 2018 at 7:20:14 PM UTC+5:30, Dima Pasechnik 
>> wrote:
>>>
>>> For starters, you need Sage's python2, so that at its python prompt you 
>>> can do 
>>>
>>> >>> from sage.all import * 
>>>
>>> and this works. Are you already at this point? 
>>>
>>>
>>> On Thu, Sep 27, 2018 at 2:37 PM Abhishek Kesarwani <1907...@gmail.com> 
>>> wrote: 
>>> > 
>>> > I am trying to run Example 2: And getting following error. Please help 
>>> me. 
>>> > abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c 
>>> -lpython2.7  -lm -lutil -lpthread -ldl 
>>> > abc@Math-Sans:~/Desktop$ ./a.out 
>>> > 1+1: 
>>> > 2 
>>> > Load sage 
>>> > Traceback (most recent call last): 
>>> >   File "", line 1, in  
>>> > ImportError: No module named sage.all 
>>> > Factor 2310: 
>>> > Traceback (most recent call last): 
>>> >   File "", line 1, in  
>>> > NameError: name 'factor' is not defined 
>>> > 
>>> > On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael 
>>> Rubinstein wrote: 
>>> >> 
>>> >> 
>>> >> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
>>> >> It gets me further but then gives a strange error message: 
>>> >> 
>>> >> Loading the Sage library... 
>>> >> 
>>> >> 
>>> >>  
>>> >> Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
>>> >> This probably occurred because a *compiled* component 
>>> >> of Sage has a bug in it (typically accessing invalid memory) 
>>> >> or is not properly wrapped with _sig_on, _sig_off. 
>>> >> You might want to run Sage under gdb with 'sage -gdb' to debug this. 
>>> >> Sage will now terminate (sorry). 
>>> >>  
>>> >> 
>>> >> 
>>> >> 
>>> >> 
>>> >> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote: 
>>> >> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote: 
>>> >> > > Example 2 
>>> >> > >  
>>> >> > 
>>> >> > > Next thing I tried to do was to embed sage in a c program, by 
>>> >> > > following 
>>> >> > >http://docs.python.org/extending/embedding.html 
>>> >> > > but that gave me errors at runtime. 
>>> >> > 
>>> >> > > For example, the following embed.c progam produced the 
>>> output/errors at the 
>>> >> > > bottom of this post. Any ideas what's wrong? Any ideas of better 
>>> ways to call 
>>> >> > > sage from within c or c++? 
>>> >> > 
>>> >> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] 
>>> (http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up 
>>> sys.argv 
>>> >> > after calling Py_Initialize(). I haven't actually tried it, though. 
>>> >> > 
>>> >> > -Willem Jan 
>>> > 
>>> > -- 
>>> > You received this message because you are subscribed to the Google 
>>> Groups "sage-devel" group. 
>>> > To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to sage-devel+...@googlegroups.com. 
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>>> > For more options, visit https://groups.google.com/d/optout. 
>>>
>> -- 
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[sage-devel] Re: embedding sage in c or c++

[Simon King]

Hi Abhishek,

On 2018-09-29, Abhishek Kesarwani <1907a...@gmail.com> wrote:
>
> No, I am getting this error:
>
 sage --python
> Traceback (most recent call last):
>   File "", line 1, in 
> NameError: name 'sage' is not defined

"sage --python" is the command that you should use on the command line
to *start* python (i.e., it is not a command to be used *in* python).

If the reason hasn't yet been explained to you in this thread: Sage has
its own installation of Python, that is totally separate from your
system-wide installation of Python. Hence, your system-wide installation
of Python simply doesn't know that sage exists.

Therefore, you should use Sage's python installation (that you can start
with the command
 sage --python
) and there you should be able to use Sage. Example:

$ ./sage --python
Python 2.7.15 (default, Aug  5 2018, 14:15:34) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> from sage.all import ZZ
>>> type(5), type(ZZ(5))
(, )

Note that the line "from sage.all import ZZ" takes a very long time, and
to my surprise directly doing "from sage.rings.integer_ring import Z as
ZZ" doesn't work.

Best regards,
Simon

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Re: [sage-devel] Re: embedding sage in c or c++

[Abhishek Kesarwani]

No, I am getting this error:

>>> sage --python
Traceback (most recent call last):
  File "", line 1, in 
NameError: name 'sage' is not defined




On Friday, September 28, 2018 at 11:36:42 PM UTC+5:30, Dima Pasechnik wrote:
>
>
>
> On Fri, 28 Sep 2018, 18:36 Abhishek Kesarwani, <1907...@gmail.com 
> > wrote:
>
>> Thank you, sir, for replying.  I tried to run it again after Installing
>> Sage python2, it gives the following error. 
>>
>
> What version of Sagemath have you installed?
> Are you able to start Python by running
>
> sage --python
>
>
>
>> 1+1000:
>> 1001
>> Load sage 
>> Traceback (most recent call last):
>>   File "", line 1, in 
>> ImportError: No module named all
>> abc@Math-Sans:~/Downloads/SageMath$ python 
>> Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
>> [GCC 5.4.0 20160609] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>>  from sage.all import * 
>>   File "", line 1
>> from sage.all import * 
>> ^
>> IndentationError: unexpected indent
>> >>>
>>
>> On Thursday, September 27, 2018 at 7:20:14 PM UTC+5:30, Dima Pasechnik 
>> wrote:
>>>
>>> For starters, you need Sage's python2, so that at its python prompt you 
>>> can do 
>>>
>>> >>> from sage.all import * 
>>>
>>> and this works. Are you already at this point? 
>>>
>>>
>>> On Thu, Sep 27, 2018 at 2:37 PM Abhishek Kesarwani <1907...@gmail.com> 
>>> wrote: 
>>> > 
>>> > I am trying to run Example 2: And getting following error. Please help 
>>> me. 
>>> > abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c 
>>> -lpython2.7  -lm -lutil -lpthread -ldl 
>>> > abc@Math-Sans:~/Desktop$ ./a.out 
>>> > 1+1: 
>>> > 2 
>>> > Load sage 
>>> > Traceback (most recent call last): 
>>> >   File "", line 1, in  
>>> > ImportError: No module named sage.all 
>>> > Factor 2310: 
>>> > Traceback (most recent call last): 
>>> >   File "", line 1, in  
>>> > NameError: name 'factor' is not defined 
>>> > 
>>> > On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael 
>>> Rubinstein wrote: 
>>> >> 
>>> >> 
>>> >> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
>>> >> It gets me further but then gives a strange error message: 
>>> >> 
>>> >> Loading the Sage library... 
>>> >> 
>>> >> 
>>> >>  
>>> >> Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
>>> >> This probably occurred because a *compiled* component 
>>> >> of Sage has a bug in it (typically accessing invalid memory) 
>>> >> or is not properly wrapped with _sig_on, _sig_off. 
>>> >> You might want to run Sage under gdb with 'sage -gdb' to debug this. 
>>> >> Sage will now terminate (sorry). 
>>> >>  
>>> >> 
>>> >> 
>>> >> 
>>> >> 
>>> >> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote: 
>>> >> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote: 
>>> >> > > Example 2 
>>> >> > >  
>>> >> > 
>>> >> > > Next thing I tried to do was to embed sage in a c program, by 
>>> >> > > following 
>>> >> > >http://docs.python.org/extending/embedding.html 
>>> >> > > but that gave me errors at runtime. 
>>> >> > 
>>> >> > > For example, the following embed.c progam produced the 
>>> output/errors at the 
>>> >> > > bottom of this post. Any ideas what's wrong? Any ideas of better 
>>> ways to call 
>>> >> > > sage from within c or c++? 
>>> >> > 
>>> >> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] 
>>> (http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up 
>>> sys.argv 
>>> >> > after calling Py_Initialize(). I haven't actually tried it, though. 
>>> >> > 
>>> >> > -Willem Jan 
>>> > 
>>> > -- 
>>> > You received this message because you are subscribed to the Google 
>>> Groups "sage-devel" group. 
>>> > To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to sage-devel+...@googlegroups.com. 
>>> > To post to this group, send email to sage-...@googlegroups.com. 
>>> > Visit this group at https://groups.google.com/group/sage-devel. 
>>> > For more options, visit https://groups.google.com/d/optout. 
>>>
>> -- 
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>> "sage-devel" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
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>>
>

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Re: [sage-devel] Re: embedding sage in c or c++

[Dima Pasechnik]

On Fri, 28 Sep 2018, 18:36 Abhishek Kesarwani, <1907a...@gmail.com> wrote:

> Thank you, sir, for replying.  I tried to run it again after Installing
> Sage python2, it gives the following error.
>

What version of Sagemath have you installed?
Are you able to start Python by running

sage --python



> 1+1000:
> 1001
> Load sage
> Traceback (most recent call last):
>   File "", line 1, in 
> ImportError: No module named all
> abc@Math-Sans:~/Downloads/SageMath$ python
> Python 2.7.12 (default, Dec  4 2017, 14:50:18)
> [GCC 5.4.0 20160609] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>>  from sage.all import *
>   File "", line 1
> from sage.all import *
> ^
> IndentationError: unexpected indent
> >>>
>
> On Thursday, September 27, 2018 at 7:20:14 PM UTC+5:30, Dima Pasechnik
> wrote:
>>
>> For starters, you need Sage's python2, so that at its python prompt you
>> can do
>>
>> >>> from sage.all import *
>>
>> and this works. Are you already at this point?
>>
>>
>> On Thu, Sep 27, 2018 at 2:37 PM Abhishek Kesarwani <1907...@gmail.com>
>> wrote:
>> >
>> > I am trying to run Example 2: And getting following error. Please help
>> me.
>> > abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c
>> -lpython2.7  -lm -lutil -lpthread -ldl
>> > abc@Math-Sans:~/Desktop$ ./a.out
>> > 1+1:
>> > 2
>> > Load sage
>> > Traceback (most recent call last):
>> >   File "", line 1, in 
>> > ImportError: No module named sage.all
>> > Factor 2310:
>> > Traceback (most recent call last):
>> >   File "", line 1, in 
>> > NameError: name 'factor' is not defined
>> >
>> > On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael
>> Rubinstein wrote:
>> >>
>> >>
>> >> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
>> >> It gets me further but then gives a strange error message:
>> >>
>> >> Loading the Sage library...
>> >>
>> >>
>> >> 
>> >> Unhandled SIGSEGV: A segmentation fault occurred in Sage.
>> >> This probably occurred because a *compiled* component
>> >> of Sage has a bug in it (typically accessing invalid memory)
>> >> or is not properly wrapped with _sig_on, _sig_off.
>> >> You might want to run Sage under gdb with 'sage -gdb' to debug this.
>> >> Sage will now terminate (sorry).
>> >> 
>> >>
>> >>
>> >>
>> >>
>> >> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote:
>> >> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote:
>> >> > > Example 2
>> >> > > 
>> >> >
>> >> > > Next thing I tried to do was to embed sage in a c program, by
>> >> > > following
>> >> > >http://docs.python.org/extending/embedding.html
>> >> > > but that gave me errors at runtime.
>> >> >
>> >> > > For example, the following embed.c progam produced the
>> output/errors at the
>> >> > > bottom of this post. Any ideas what's wrong? Any ideas of better
>> ways to call
>> >> > > sage from within c or c++?
>> >> >
>> >> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] (
>> http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up
>> sys.argv
>> >> > after calling Py_Initialize(). I haven't actually tried it, though.
>> >> >
>> >> > -Willem Jan
>> >
>> > --
>> > You received this message because you are subscribed to the Google
>> Groups "sage-devel" group.
>> > To unsubscribe from this group and stop receiving emails from it, send
>> an email to sage-devel+...@googlegroups.com.
>> > To post to this group, send email to sage-...@googlegroups.com.
>> > Visit this group at https://groups.google.com/group/sage-devel.
>> > For more options, visit https://groups.google.com/d/optout.
>>
> --
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Re: [sage-devel] Re: embedding sage in c or c++

[Abhishek Kesarwani]

Thank you, sir, for replying.  I tried to run it again after Installing
Sage python2, it gives the following error. 

1+1000:
1001
Load sage 
Traceback (most recent call last):
  File "", line 1, in 
ImportError: No module named all
abc@Math-Sans:~/Downloads/SageMath$ python 
Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>  from sage.all import * 
  File "", line 1
from sage.all import * 
^
IndentationError: unexpected indent
>>>

On Thursday, September 27, 2018 at 7:20:14 PM UTC+5:30, Dima Pasechnik 
wrote:
>
> For starters, you need Sage's python2, so that at its python prompt you 
> can do 
>
> >>> from sage.all import * 
>
> and this works. Are you already at this point? 
>
>
> On Thu, Sep 27, 2018 at 2:37 PM Abhishek Kesarwani <1907...@gmail.com 
> > wrote: 
> > 
> > I am trying to run Example 2: And getting following error. Please help 
> me. 
> > abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c -lpython2.7 
>  -lm -lutil -lpthread -ldl 
> > abc@Math-Sans:~/Desktop$ ./a.out 
> > 1+1: 
> > 2 
> > Load sage 
> > Traceback (most recent call last): 
> >   File "", line 1, in  
> > ImportError: No module named sage.all 
> > Factor 2310: 
> > Traceback (most recent call last): 
> >   File "", line 1, in  
> > NameError: name 'factor' is not defined 
> > 
> > On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael 
> Rubinstein wrote: 
> >> 
> >> 
> >> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
> >> It gets me further but then gives a strange error message: 
> >> 
> >> Loading the Sage library... 
> >> 
> >> 
> >>  
> >> Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
> >> This probably occurred because a *compiled* component 
> >> of Sage has a bug in it (typically accessing invalid memory) 
> >> or is not properly wrapped with _sig_on, _sig_off. 
> >> You might want to run Sage under gdb with 'sage -gdb' to debug this. 
> >> Sage will now terminate (sorry). 
> >>  
> >> 
> >> 
> >> 
> >> 
> >> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote: 
> >> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote: 
> >> > > Example 2 
> >> > >  
> >> > 
> >> > > Next thing I tried to do was to embed sage in a c program, by 
> >> > > following 
> >> > >http://docs.python.org/extending/embedding.html 
> >> > > but that gave me errors at runtime. 
> >> > 
> >> > > For example, the following embed.c progam produced the 
> output/errors at the 
> >> > > bottom of this post. Any ideas what's wrong? Any ideas of better 
> ways to call 
> >> > > sage from within c or c++? 
> >> > 
> >> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] (
> http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up 
> sys.argv 
> >> > after calling Py_Initialize(). I haven't actually tried it, though. 
> >> > 
> >> > -Willem Jan 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> Groups "sage-devel" group. 
> > To unsubscribe from this group and stop receiving emails from it, send 
> an email to sage-devel+...@googlegroups.com . 
> > To post to this group, send email to sage-...@googlegroups.com 
> . 
> > Visit this group at https://groups.google.com/group/sage-devel. 
> > For more options, visit https://groups.google.com/d/optout. 
>

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Re: [sage-devel] Re: embedding sage in c or c++

[Dima Pasechnik]

For starters, you need Sage's python2, so that at its python prompt you can do

>>> from sage.all import *

and this works. Are you already at this point?


On Thu, Sep 27, 2018 at 2:37 PM Abhishek Kesarwani <1907a...@gmail.com> wrote:
>
> I am trying to run Example 2: And getting following error. Please help me.
> abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c -lpython2.7  -lm 
> -lutil -lpthread -ldl
> abc@Math-Sans:~/Desktop$ ./a.out
> 1+1:
> 2
> Load sage
> Traceback (most recent call last):
>   File "", line 1, in 
> ImportError: No module named sage.all
> Factor 2310:
> Traceback (most recent call last):
>   File "", line 1, in 
> NameError: name 'factor' is not defined
>
> On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael Rubinstein 
> wrote:
>>
>>
>> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
>> It gets me further but then gives a strange error message:
>>
>> Loading the Sage library...
>>
>>
>> 
>> Unhandled SIGSEGV: A segmentation fault occurred in Sage.
>> This probably occurred because a *compiled* component
>> of Sage has a bug in it (typically accessing invalid memory)
>> or is not properly wrapped with _sig_on, _sig_off.
>> You might want to run Sage under gdb with 'sage -gdb' to debug this.
>> Sage will now terminate (sorry).
>> 
>>
>>
>>
>>
>> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote:
>> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote:
>> > > Example 2
>> > > 
>> >
>> > > Next thing I tried to do was to embed sage in a c program, by
>> > > following
>> > >http://docs.python.org/extending/embedding.html
>> > > but that gave me errors at runtime.
>> >
>> > > For example, the following embed.c progam produced the output/errors at 
>> > > the
>> > > bottom of this post. Any ideas what's wrong? Any ideas of better ways to 
>> > > call
>> > > sage from within c or c++?
>> >
>> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] 
>> > (http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up sys.argv
>> > after calling Py_Initialize(). I haven't actually tried it, though.
>> >
>> > -Willem Jan
>
> --
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[sage-devel] Re: embedding sage in c or c++

[Abhishek Kesarwani]

I am trying to run Example 2: And getting following error. Please help me.
abc@Math-Sans:~/Desktop$ gcc -I/usr/include/python2.7 ABC.c -lpython2.7 
 -lm -lutil -lpthread -ldl 
abc@Math-Sans:~/Desktop$ ./a.out
1+1:
2
Load sage 
Traceback (most recent call last):
  File "", line 1, in 
ImportError: No module named sage.all
Factor 2310:
Traceback (most recent call last):
  File "", line 1, in 
NameError: name 'factor' is not defined

On Tuesday, September 13, 2011 at 9:16:05 PM UTC+5:30, Michael Rubinstein 
wrote:
>
>
> I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
> It gets me further but then gives a strange error message: 
>
> Loading the Sage library... 
>
>
>  
> Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
> This probably occurred because a *compiled* component 
> of Sage has a bug in it (typically accessing invalid memory) 
> or is not properly wrapped with _sig_on, _sig_off. 
> You might want to run Sage under gdb with 'sage -gdb' to debug this. 
> Sage will now terminate (sorry). 
>  
>
>
>
>
> On Sep 13, 2:32 pm, Willem Jan Palenstijn  wrote: 
> > On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote: 
> > > Example 2 
> > >  
> > 
> > > Next thing I tried to do was to embed sage in a c program, by 
> > > following 
> > >http://docs.python.org/extending/embedding.html 
> > > but that gave me errors at runtime. 
> > 
> > > For example, the following embed.c progam produced the output/errors 
> at the 
> > > bottom of this post. Any ideas what's wrong? Any ideas of better ways 
> to call 
> > > sage from within c or c++? 
> > 
> > Some quick googling suggests you may have to call PySys_SetArgv[Ex] (
> http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up 
> sys.argv 
> > after calling Py_Initialize(). I haven't actually tried it, though. 
> > 
> > -Willem Jan

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Re: [sage-devel] Re: embedding sage in c or c++

[Dima Pasechnik]

On Thursday, February 22, 2018 at 3:31:46 PM UTC, Erik Bray wrote:
>
> On Thu, Feb 22, 2018 at 11:44 AM, J. Javan  > wrote: 
> > Dear Erik, 
> > 
> > I highly appreciate you for taking the time and helping people. 
> > Basically, we have some mathematical problems in a GUI application 
> > implemented in Qt-C++ which sage is capable of computing them. This is 
> why 
> > we decided to integrate sage in our app. 
> > 
> > However, As you mentioned it is a very complex or even impossible task 
> to 
> > integrate sage into a windows application since sage is a software suit 
> > rather than a python library. 
> > 
> > After googling some, I found another project called SageMathCell which 
> > provides REST interface to a sage server. I guess this is the best of 
> way 
> > achieving what we are looking for. Unless I'm very much mistaken, with 
> > SageMathCell we can run all sage scripts with peace of mind. 
>
> I probably wouldn't--depending on what your application does it would 
> only slow things down to be passing data between two executables over 
> the HTTP stack.  This may be a relatively easy way but there are 
> betters. 
>
> If your application already depends fully on Sage (which, granted, is 
> a big dependency), then why not build your application in the Sage + 
> Cygwin environment?  There's no reason you couldn't do that, and would 
> allow you to incorporate the Python interpreter directly into your 
> application.  Additional, perhaps the C++ component of your 
> application can be refactored into a library, and the GUI component 
> can use PyQT or a similar library, which would simplify building (so 
> long as you have no trouble getting PyQT built against Sage's Python). 
> (Or maybe the C++ component can go away entirely if it's only for the 
> GUI--either way). 
>

Cantor (https://github.com/KDE/cantor) is a KDE frontend to computer 
algebra systems, including Sagemath.
So this looks similar to what you're after, no?


> Beyond that, without seeing your code it's hard to comment much, but I 
> wouldn't overcomplicate things.  Again, if Sage is a hard dependency 
> of your project then you might as well build the project fully in 
> Sage's runtime environment. 
>
>
>
> > As mentioned in this tutorial one should URL encode the sage script and 
> POST 
> > it to 
> > http://{IP address of your SageMathCell server}:/service. 
> > 
> > This perfectly works however I cannot it get to work for some scripts. 
> > 
> > For instance calling the service with below code works: 
> > 
> > QNetworkRequest request; 
> > 
> > request.setUrl(QUrl("http://192.168.224.130:/service;)); 
> > 
> > request.setHeader(QNetworkRequest::ContentTypeHeader, 
> > "application/x-www-form-urlencoded"); 
> > 
> > arrReqBody = "code=print(1+1)"; // This is the sage script which is put 
> in 
> > HTTP body request 
> > 
> > arrReqBody = request.url().toPercentEncoding(arrReqBody, "=()[].:,"); 
> > 
> > QNetworkAccessManager *netMgr = new QNetworkAccessManager(); 
> > 
> > QObject::connect(netMgr, SIGNAL(finished(QNetworkReply*)), this, 
> > SLOT(sageReply(QNetworkReply*))); 
> > 
> > netMgr->post(request, arrReqBody); 
> > 
> > Which returns the result in stdout as shown below: 
> > "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, 
> > \"user_expressions\": {}, \"payload\": []}, \"success\": true, 
> \"stdout\": 
> > \"2\\n\"}" 
> > 
> > On the other hand, changing sage script to below does not work. 
> > 
> > arrReqBody = 
> > 
> "code='Y=Polyhedron(vertices=[(0,0,0,0,0,0,0,0),(0,0,0,1,0,1,0,1),(0,0,0,1,0,1,1,1),(0,0,0,1,1,1,0,1)])";
>  
>
> > 
> > arrReqBody += "for v in Y.inequality_generator():print v'"; 
> > 
> > 
> > Above HTTP body returns below which states that the script has been 
> > successfully ran but I've no idea why stdout is missing. 
> > 
> > "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, 
> > \"user_expressions\": {}, \"payload\": []}, \"success\": true}" 
>
> It looks like you have some extra quoting here.  You have 
>
>arrReqBody="code='...'" 
>
> So the 'code' in this case is just a string literal '...' that happens 
> to contain the actual code you want.  AFAICT there's no reason for 
> those extra single-quotes.  Just as guess though. 
>
> Best, 
> E 
>
>
> > My best guess is that there is something wrong about the encoding 
> however no 
> > luck until now. 
> > I would appreciate it if someone could lend me a hand on this. 
> > 
> > Thanks, 
> > Javan 
> > 
> > 
> > 
> > On Wednesday, January 31, 2018 at 5:30:16 PM UTC+3:30, Erik Bray wrote: 
> >> 
> >> On Tue, Jan 30, 2018 at 2:35 PM, J. Javan  wrote: 
> >> > I can see that you have successfully linked against sage. 
> >> > I also have a Qt GUI application which needs to do some mathematics 
> in 
> >> > the 
> >> > background. 
> >> > This application is targeted for windows platforms. I have installed 
> >> > sage 
> >> > from this link. 
> >> > 

Re: [sage-devel] Re: embedding sage in c or c++

[Erik Bray]

On Thu, Feb 22, 2018 at 11:44 AM, J. Javan  wrote:
> Dear Erik,
>
> I highly appreciate you for taking the time and helping people.
> Basically, we have some mathematical problems in a GUI application
> implemented in Qt-C++ which sage is capable of computing them. This is why
> we decided to integrate sage in our app.
>
> However, As you mentioned it is a very complex or even impossible task to
> integrate sage into a windows application since sage is a software suit
> rather than a python library.
>
> After googling some, I found another project called SageMathCell which
> provides REST interface to a sage server. I guess this is the best of way
> achieving what we are looking for. Unless I'm very much mistaken, with
> SageMathCell we can run all sage scripts with peace of mind.

I probably wouldn't--depending on what your application does it would
only slow things down to be passing data between two executables over
the HTTP stack.  This may be a relatively easy way but there are
betters.

If your application already depends fully on Sage (which, granted, is
a big dependency), then why not build your application in the Sage +
Cygwin environment?  There's no reason you couldn't do that, and would
allow you to incorporate the Python interpreter directly into your
application.  Additional, perhaps the C++ component of your
application can be refactored into a library, and the GUI component
can use PyQT or a similar library, which would simplify building (so
long as you have no trouble getting PyQT built against Sage's Python).
(Or maybe the C++ component can go away entirely if it's only for the
GUI--either way).

Beyond that, without seeing your code it's hard to comment much, but I
wouldn't overcomplicate things.  Again, if Sage is a hard dependency
of your project then you might as well build the project fully in
Sage's runtime environment.



> As mentioned in this tutorial one should URL encode the sage script and POST
> it to
> http://{IP address of your SageMathCell server}:/service.
>
> This perfectly works however I cannot it get to work for some scripts.
>
> For instance calling the service with below code works:
>
> QNetworkRequest request;
>
> request.setUrl(QUrl("http://192.168.224.130:/service;));
>
> request.setHeader(QNetworkRequest::ContentTypeHeader,
> "application/x-www-form-urlencoded");
>
> arrReqBody = "code=print(1+1)"; // This is the sage script which is put in
> HTTP body request
>
> arrReqBody = request.url().toPercentEncoding(arrReqBody, "=()[].:,");
>
> QNetworkAccessManager *netMgr = new QNetworkAccessManager();
>
> QObject::connect(netMgr, SIGNAL(finished(QNetworkReply*)), this,
> SLOT(sageReply(QNetworkReply*)));
>
> netMgr->post(request, arrReqBody);
>
> Which returns the result in stdout as shown below:
> "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1,
> \"user_expressions\": {}, \"payload\": []}, \"success\": true, \"stdout\":
> \"2\\n\"}"
>
> On the other hand, changing sage script to below does not work.
>
> arrReqBody =
> "code='Y=Polyhedron(vertices=[(0,0,0,0,0,0,0,0),(0,0,0,1,0,1,0,1),(0,0,0,1,0,1,1,1),(0,0,0,1,1,1,0,1)])";
>
> arrReqBody += "for v in Y.inequality_generator():print v'";
>
>
> Above HTTP body returns below which states that the script has been
> successfully ran but I've no idea why stdout is missing.
>
> "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1,
> \"user_expressions\": {}, \"payload\": []}, \"success\": true}"

It looks like you have some extra quoting here.  You have

   arrReqBody="code='...'"

So the 'code' in this case is just a string literal '...' that happens
to contain the actual code you want.  AFAICT there's no reason for
those extra single-quotes.  Just as guess though.

Best,
E


> My best guess is that there is something wrong about the encoding however no
> luck until now.
> I would appreciate it if someone could lend me a hand on this.
>
> Thanks,
> Javan
>
>
>
> On Wednesday, January 31, 2018 at 5:30:16 PM UTC+3:30, Erik Bray wrote:
>>
>> On Tue, Jan 30, 2018 at 2:35 PM, J. Javan  wrote:
>> > I can see that you have successfully linked against sage.
>> > I also have a Qt GUI application which needs to do some mathematics in
>> > the
>> > background.
>> > This application is targeted for windows platforms. I have installed
>> > sage
>> > from this link.
>> > Could you please guide me on how to link my app with sage?
>> >
>> > I'm running your code as below
>> >
>> > #include 
>> >
>> >
>> > int main(int argc, char *argv[])
>> >
>> > {
>> >
>> >
>> > int retVal = 0;
>> >
>> > Py_Initialize();
>> >
>> > PySys_SetArgv(argc, (wchar_t**) argv);
>> >
>> > printf("1+1:\n");
>> >
>> > PyRun_SimpleString("print (1+1)");
>> >
>> > printf("Load sage \n");
>> >
>> > retVal = PyRun_SimpleString("from sage.all import *");
>> >
>> > printf("Factor 2310:\n");
>> >
>> > PyRun_SimpleString("print factor(2310)");
>> >
>> >

Re: [sage-devel] Re: embedding sage in c or c++

[J. Javan]

Dear Erik,

I highly appreciate you for taking the time and helping people. 
Basically, we have some mathematical problems in a GUI application 
implemented in Qt-C++ which sage is capable of computing them. This is why 
we decided to integrate sage in our app.

However, As you mentioned it is a very complex or even impossible task to 
integrate sage into a windows application since sage is a software suit 
rather than a python library.

After googling some, I found another project called SageMathCell 
 which provides REST 
 interface 
to a sage server. I guess this is the best of way achieving what we are 
looking for. Unless I'm very much mistaken, with SageMathCell we can run 
all sage scripts with peace of mind. 

As mentioned in this tutorial 

 one 
should URL encode the sage script and POST it to 
http://{IP address of your SageMathCell server}:/service.

This perfectly works however I cannot it get to work for some scripts.

For instance calling the service with below code works:

QNetworkRequest request;

request.setUrl(QUrl("http://192.168.224.130:/service;));

request.setHeader(QNetworkRequest::ContentTypeHeader, 
"application/x-www-form-urlencoded");

arrReqBody = "code=print(1+1)"; // This is the sage script which is put in HTTP 
body request

arrReqBody = request.url().toPercentEncoding(arrReqBody, "=()[].:,");

QNetworkAccessManager *netMgr = new QNetworkAccessManager();

QObject::connect(netMgr, SIGNAL(finished(QNetworkReply*)), this, 
SLOT(sageReply(QNetworkReply*)));

netMgr->post(request, arrReqBody);

Which returns the result in stdout as shown below:
"{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, 
\"user_expressions\": {}, \"payload\": []}, \"success\": true, \"stdout\": 
\"2\\n\"}"

On the other hand, changing sage script to below does not work.

arrReqBody = 
"code='Y=Polyhedron(vertices=[(0,0,0,0,0,0,0,0),(0,0,0,1,0,1,0,1),(0,0,0,1,0,1,1,1),(0,0,0,1,1,1,0,1)])";

arrReqBody += "for v in Y.inequality_generator():print v'";


Above HTTP body returns below which states that the script has been 
successfully ran but I've no idea why stdout is missing.

"{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, 
\"user_expressions\": {}, \"payload\": []}, \"success\": true}"



My best guess is that there is something wrong about the encoding however 
no luck until now.
I would appreciate it if someone could lend me a hand on this.

Thanks,
Javan



On Wednesday, January 31, 2018 at 5:30:16 PM UTC+3:30, Erik Bray wrote:
>
> On Tue, Jan 30, 2018 at 2:35 PM, J. Javan  > wrote: 
> > I can see that you have successfully linked against sage. 
> > I also have a Qt GUI application which needs to do some mathematics in 
> the 
> > background. 
> > This application is targeted for windows platforms. I have installed 
> sage 
> > from this link. 
> > Could you please guide me on how to link my app with sage? 
> > 
> > I'm running your code as below 
> > 
> > #include  
> > 
> > 
> > int main(int argc, char *argv[]) 
> > 
> > { 
> > 
> > 
> > int retVal = 0; 
> > 
> > Py_Initialize(); 
> > 
> > PySys_SetArgv(argc, (wchar_t**) argv); 
> > 
> > printf("1+1:\n"); 
> > 
> > PyRun_SimpleString("print (1+1)"); 
> > 
> > printf("Load sage \n"); 
> > 
> > retVal = PyRun_SimpleString("from sage.all import *"); 
> > 
> > printf("Factor 2310:\n"); 
> > 
> > PyRun_SimpleString("print factor(2310)"); 
> > 
> > Py_Finalize(); 
> > 
> > return 0; 
> > 
> > } 
> > 
> > 
> > And this gives me the following output: 
> > 
> > 1+1: 
> > 2 
> > Load sage 
> > Traceback (most recent call last): 
> >   File "", line 1, in  
> > ModuleNotFoundError: No module named 'sage' 
> > Factor 2310: 
> >   File "", line 1 
> > print factor(2310) 
> >^ 
> > SyntaxError: invalid syntax 
> > Press  to close this window... 
> > 
> > The output is clearly stating that sage cannot be found. 
> > This is because I have linked to my locally compiled python static 
> > libraries(Actually I have downloaded python source code and linked 
> against 
> > it.) which are not aware of sage. 
> > 
> > Also I tried to link against python provided in sage installation but I 
> > can't find any "python.lib" in it. 
> > I have also set an environment variable $SAGE_LOCAL pointing to 
> "C:\Program 
> > Files\SageMath 8.1\runtime\opt\sagemath-8.1\local" but no luck. 
> > 
> > Environment: 
> > Qt_v5.9 
> > Windows 7 
> > Python_v3.6.4 
> > Sage_v8.1 
>
> Hi, 
>
> I saw this mail forwarded to sage-devel, but it appears to be missing 
> quite a lot of context.  What, specifically, is it that you're trying 
> to do? 
>
> To be clear, Sage for Windows is not just a Python module.  It's an 
> entire software suite, including its own Python interpreter. 

Re: [sage-devel] Re: embedding sage in c or c++

[Erik Bray]

On Tue, Jan 30, 2018 at 2:35 PM, J. Javan  wrote:
> I can see that you have successfully linked against sage.
> I also have a Qt GUI application which needs to do some mathematics in the
> background.
> This application is targeted for windows platforms. I have installed sage
> from this link.
> Could you please guide me on how to link my app with sage?
>
> I'm running your code as below
>
> #include 
>
>
> int main(int argc, char *argv[])
>
> {
>
>
> int retVal = 0;
>
> Py_Initialize();
>
> PySys_SetArgv(argc, (wchar_t**) argv);
>
> printf("1+1:\n");
>
> PyRun_SimpleString("print (1+1)");
>
> printf("Load sage \n");
>
> retVal = PyRun_SimpleString("from sage.all import *");
>
> printf("Factor 2310:\n");
>
> PyRun_SimpleString("print factor(2310)");
>
> Py_Finalize();
>
> return 0;
>
> }
>
>
> And this gives me the following output:
>
> 1+1:
> 2
> Load sage
> Traceback (most recent call last):
>   File "", line 1, in 
> ModuleNotFoundError: No module named 'sage'
> Factor 2310:
>   File "", line 1
> print factor(2310)
>^
> SyntaxError: invalid syntax
> Press  to close this window...
>
> The output is clearly stating that sage cannot be found.
> This is because I have linked to my locally compiled python static
> libraries(Actually I have downloaded python source code and linked against
> it.) which are not aware of sage.
>
> Also I tried to link against python provided in sage installation but I
> can't find any "python.lib" in it.
> I have also set an environment variable $SAGE_LOCAL pointing to "C:\Program
> Files\SageMath 8.1\runtime\opt\sagemath-8.1\local" but no luck.
>
> Environment:
> Qt_v5.9
> Windows 7
> Python_v3.6.4
> Sage_v8.1

Hi,

I saw this mail forwarded to sage-devel, but it appears to be missing
quite a lot of context.  What, specifically, is it that you're trying
to do?

To be clear, Sage for Windows is not just a Python module.  It's an
entire software suite, including its own Python interpreter.  All of
it is complied with Cygwin.  You won't be able to "import sage" from
different Python.

If you're trying to build an application that uses Sage internally
somehow you have two choices really--build the entire software inside
Sage's environment (you can do this, for example, from the Sage Shell
which is really a Cygwin shell in the Sage environment).  That is,
build all your software in Cygwin, linking with the Python in Sage,
etc.  This can be tricky unless you know what you're doing with Sage's
development environment.

Your other alternative is that you can always call Sage's Python from
outside Sage (but again, you'll still have to set a few environment
variables at a minimum), and depending on how Python is integrated
into your software this could mean anything from running the Python
interpreter as a subprocess and communicating with it, to dynamically
linking with the libpython DLL in Sage and running C Python code like
in your example above.  Though to be honest I'm not exactly sure if
it's possible to link a Cygwin DLL into a non-Cygwin executable. But I
think maybe it's possible

Please let me know more about what you're trying to do though and I
can probably be of more help.

Best,
E


> On Wednesday, September 14, 2011 at 4:15:58 AM UTC+4:30, Michael Rubinstein
> wrote:
>>
>> Thanks! That worked for me too, though I'm not sure how you decided on
>> the specific
>> choices of libraries to link to.
>>
>> Mike
>>
>> On Sep 13, 6:39 pm, Willem Jan Palenstijn  wrote:
>> > On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote:
>> >
>> > > I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
>> > > It gets me further but then gives a strange error message:
>> >
>> > > Loading the Sage library...
>> >
>> > > 
>> > > Unhandled SIGSEGV: A segmentation fault occurred in Sage.
>> > > This probably occurred because a *compiled* component
>> > > of Sage has a bug in it (typically accessing invalid memory)
>> > > or is not properly wrapped with _sig_on, _sig_off.
>> > > You might want to run Sage under gdb with 'sage -gdb' to debug this.
>> > > Sage will now terminate (sorry).
>> > > 
>> >
>> > I've just tried it here with your embed.c + PySys_SetArgv(argc, argv),
>> > and it
>> > works for me when I link against libpython2.6 dynamically:
>> >
>> > $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil
>> > -lpthread -ldl -o embed
>> > $ ./embed
>> > 1+1:
>> > 2
>> > Load sage
>> > Factor 2310:
>> > 2 * 3 * 5 * 7 * 11
>> > $
>> >
>> > This is 64 bit linux with sage 4.7.1rc1.
>> >
>> > -Willem Jan
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-devel" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to sage-devel+unsubscr...@googlegroups.com.

[sage-devel] Re: embedding sage in c or c++

[Dima Pasechnik]

Sage won't run natively on Windows, you need Cygwin. This might explain why 
it does not work for you.

On Tuesday, January 30, 2018 at 1:35:45 PM UTC, J. Javan wrote:
>
> I can see that you have successfully linked against sage.
> I also have a Qt GUI application which needs to do some mathematics in the 
> background.
> This application is targeted for windows platforms. I have installed sage 
> from this link 
> 
> .
> Could you please guide me on how to link my app with sage?
>
> I'm running your code as below
>
> #include 
>
>
> int main(int argc, char *argv[])
>
> {
>
>
> int retVal = 0;
>
> Py_Initialize();
>
> PySys_SetArgv(argc, (wchar_t**) argv);
>
> printf("1+1:\n");
>
> PyRun_SimpleString("print (1+1)");
>
> printf("Load sage \n");
>
> retVal = PyRun_SimpleString("from sage.all import *");
>
> printf("Factor 2310:\n");
>
> PyRun_SimpleString("print factor(2310)");
>
> Py_Finalize();
>
> return 0;
>
> }
>
>
> And this gives me the following output:
>
> 1+1:
> 2
> Load sage
> Traceback (most recent call last):
>   File "", line 1, in 
> ModuleNotFoundError: No module named 'sage'
> Factor 2310:
>   File "", line 1
> print factor(2310)
>^
> SyntaxError: invalid syntax
> Press  to close this window...
>
> The output is clearly stating that sage cannot be found.
> This is because I have linked to my locally compiled python static 
> libraries(Actually I have downloaded python source code and linked against 
> it.) which are not aware of sage.
>
> Also I tried to link against python provided in sage installation but I 
> can't find any "python.lib" in it.
> I have also set an environment variable $SAGE_LOCAL pointing to 
> "C:\Program Files\SageMath 8.1\runtime\opt\sagemath-8.1\local" but no luck.
>
> Environment:
> Qt_v5.9
> Windows 7
> Python_v3.6.4
> Sage_v8.1
>
> On Wednesday, September 14, 2011 at 4:15:58 AM UTC+4:30, Michael 
> Rubinstein wrote:
>>
>> Thanks! That worked for me too, though I'm not sure how you decided on 
>> the specific 
>> choices of libraries to link to. 
>>
>> Mike 
>>
>> On Sep 13, 6:39 pm, Willem Jan Palenstijn  wrote: 
>> > On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote: 
>> > 
>> > > I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
>> > > It gets me further but then gives a strange error message: 
>> > 
>> > > Loading the Sage library... 
>> > 
>> > >  
>> > > Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
>> > > This probably occurred because a *compiled* component 
>> > > of Sage has a bug in it (typically accessing invalid memory) 
>> > > or is not properly wrapped with _sig_on, _sig_off. 
>> > > You might want to run Sage under gdb with 'sage -gdb' to debug this. 
>> > > Sage will now terminate (sorry). 
>> > >  
>> > 
>> > I've just tried it here with your embed.c + PySys_SetArgv(argc, argv), 
>> and it 
>> > works for me when I link against libpython2.6 dynamically: 
>> > 
>> > $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil 
>> -lpthread -ldl -o embed 
>> > $ ./embed 
>> > 1+1: 
>> > 2 
>> > Load sage 
>> > Factor 2310: 
>> > 2 * 3 * 5 * 7 * 11 
>> > $ 
>> > 
>> > This is 64 bit linux with sage 4.7.1rc1. 
>> > 
>> > -Willem Jan
>
>

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[sage-devel] Re: embedding sage in c or c++

[J. Javan]

I can see that you have successfully linked against sage.
I also have a Qt GUI application which needs to do some mathematics in the 
background.
This application is targeted for windows platforms. I have installed sage 
from this link 

.
Could you please guide me on how to link my app with sage?

I'm running your code as below

#include 


int main(int argc, char *argv[])

{


int retVal = 0;

Py_Initialize();

PySys_SetArgv(argc, (wchar_t**) argv);

printf("1+1:\n");

PyRun_SimpleString("print (1+1)");

printf("Load sage \n");

retVal = PyRun_SimpleString("from sage.all import *");

printf("Factor 2310:\n");

PyRun_SimpleString("print factor(2310)");

Py_Finalize();

return 0;

}


And this gives me the following output:

1+1:
2
Load sage
Traceback (most recent call last):
  File "", line 1, in 
ModuleNotFoundError: No module named 'sage'
Factor 2310:
  File "", line 1
print factor(2310)
   ^
SyntaxError: invalid syntax
Press  to close this window...

The output is clearly stating that sage cannot be found.
This is because I have linked to my locally compiled python static 
libraries(Actually I have downloaded python source code and linked against 
it.) which are not aware of sage.

Also I tried to link against python provided in sage installation but I 
can't find any "python.lib" in it.
I have also set an environment variable $SAGE_LOCAL pointing to "C:\Program 
Files\SageMath 8.1\runtime\opt\sagemath-8.1\local" but no luck.

Environment:
Qt_v5.9
Windows 7
Python_v3.6.4
Sage_v8.1

On Wednesday, September 14, 2011 at 4:15:58 AM UTC+4:30, Michael Rubinstein 
wrote:
>
> Thanks! That worked for me too, though I'm not sure how you decided on 
> the specific 
> choices of libraries to link to. 
>
> Mike 
>
> On Sep 13, 6:39 pm, Willem Jan Palenstijn  wrote: 
> > On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote: 
> > 
> > > I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
> > > It gets me further but then gives a strange error message: 
> > 
> > > Loading the Sage library... 
> > 
> > >  
> > > Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
> > > This probably occurred because a *compiled* component 
> > > of Sage has a bug in it (typically accessing invalid memory) 
> > > or is not properly wrapped with _sig_on, _sig_off. 
> > > You might want to run Sage under gdb with 'sage -gdb' to debug this. 
> > > Sage will now terminate (sorry). 
> > >  
> > 
> > I've just tried it here with your embed.c + PySys_SetArgv(argc, argv), 
> and it 
> > works for me when I link against libpython2.6 dynamically: 
> > 
> > $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil 
> -lpthread -ldl -o embed 
> > $ ./embed 
> > 1+1: 
> > 2 
> > Load sage 
> > Factor 2310: 
> > 2 * 3 * 5 * 7 * 11 
> > $ 
> > 
> > This is 64 bit linux with sage 4.7.1rc1. 
> > 
> > -Willem Jan

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[sage-devel] Re: embedding sage in c or c++

[Jafar Javan]

Hi Michael,
I can see that you have successfully linked against sage.
I also have a Qt GUI application which needs to do some mathematics in the 
background.
This application is targeted for windows platforms. I have installed sage 
from this link 

.
Could you please guide me on how to link my app with sage?

On Wednesday, September 14, 2011 at 4:15:58 AM UTC+4:30, Michael Rubinstein 
wrote:
>
> Thanks! That worked for me too, though I'm not sure how you decided on 
> the specific 
> choices of libraries to link to. 
>
> Mike 
>
> On Sep 13, 6:39 pm, Willem Jan Palenstijn  wrote: 
> > On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote: 
> > 
> > > I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); 
> > > It gets me further but then gives a strange error message: 
> > 
> > > Loading the Sage library... 
> > 
> > >  
> > > Unhandled SIGSEGV: A segmentation fault occurred in Sage. 
> > > This probably occurred because a *compiled* component 
> > > of Sage has a bug in it (typically accessing invalid memory) 
> > > or is not properly wrapped with _sig_on, _sig_off. 
> > > You might want to run Sage under gdb with 'sage -gdb' to debug this. 
> > > Sage will now terminate (sorry). 
> > >  
> > 
> > I've just tried it here with your embed.c + PySys_SetArgv(argc, argv), 
> and it 
> > works for me when I link against libpython2.6 dynamically: 
> > 
> > $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil 
> -lpthread -ldl -o embed 
> > $ ./embed 
> > 1+1: 
> > 2 
> > Load sage 
> > Factor 2310: 
> > 2 * 3 * 5 * 7 * 11 
> > $ 
> > 
> > This is 64 bit linux with sage 4.7.1rc1. 
> > 
> > -Willem Jan

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Re: [sage-devel] Re: embedding sage in c or c++

[Willem Jan Palenstijn]

On Tue, Sep 13, 2011 at 04:45:58PM -0700, Michael Rubinstein wrote:
 Thanks! That worked for me too, though I'm not sure how you decided on
 the specific choices of libraries to link to.

Good to hear. The libraries are just what I needed to add to get it to link
without errors after starting with the -lpython2.6, by the way.


-Willem Jan

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[sage-devel] Re: embedding sage in c or c++

[Alexander Dreyer]

On 14 Sep., 11:35, Willem Jan Palenstijn w...@usecode.org wrote:
 On Tue, Sep 13, 2011 at 04:45:58PM -0700, Michael Rubinstein wrote:
  Thanks! That worked for me too, though I'm not sure how you decided on
  the specific choices of libraries to link to.

 Good to hear. The libraries are just what I needed to add to get it to link
 without errors after starting with the -lpython2.6, by the way.
More generically, you may ask python itself about this, just integrate
the following into you build system:
  python -c from distutils.sysconfig import *; print get_config_vars()
['LIBS']

My best,
  Alexander

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[sage-devel] Re: embedding sage in c or c++

[Michael Rubinstein]

I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
It gets me further but then gives a strange error message:

Loading the Sage library...



Unhandled SIGSEGV: A segmentation fault occurred in Sage.
This probably occurred because a *compiled* component
of Sage has a bug in it (typically accessing invalid memory)
or is not properly wrapped with _sig_on, _sig_off.
You might want to run Sage under gdb with 'sage -gdb' to debug this.
Sage will now terminate (sorry).





On Sep 13, 2:32 pm, Willem Jan Palenstijn w...@usecode.org wrote:
 On Tue, Sep 13, 2011 at 06:10:45AM -0700, Michael Rubinstein wrote:
  Example 2
  

  Next thing I tried to do was to embed sage in a c program, by
  following
 http://docs.python.org/extending/embedding.html
  but that gave me errors at runtime.

  For example, the following embed.c progam produced the output/errors at the
  bottom of this post. Any ideas what's wrong? Any ideas of better ways to 
  call
  sage from within c or c++?

 Some quick googling suggests you may have to call PySys_SetArgv[Ex] 
 (http://docs.python.org/c-api/init.html#PySys_SetArgvEx) to set up sys.argv
 after calling Py_Initialize(). I haven't actually tried it, though.

 -Willem Jan

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Re: [sage-devel] Re: embedding sage in c or c++

[Willem Jan Palenstijn]

On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote:
 
 I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
 It gets me further but then gives a strange error message:
 
 Loading the Sage library...
 
 
 
 Unhandled SIGSEGV: A segmentation fault occurred in Sage.
 This probably occurred because a *compiled* component
 of Sage has a bug in it (typically accessing invalid memory)
 or is not properly wrapped with _sig_on, _sig_off.
 You might want to run Sage under gdb with 'sage -gdb' to debug this.
 Sage will now terminate (sorry).
 


I've just tried it here with your embed.c + PySys_SetArgv(argc, argv), and it
works for me when I link against libpython2.6 dynamically:

$ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil -lpthread 
-ldl -o embed
$ ./embed
1+1:
2
Load sage 
Factor 2310:
2 * 3 * 5 * 7 * 11
$


This is 64 bit linux with sage 4.7.1rc1.



-Willem Jan

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[sage-devel] Re: embedding sage in c or c++

[Michael Rubinstein]

Thanks! That worked for me too, though I'm not sure how you decided on
the specific
choices of libraries to link to.

Mike

On Sep 13, 6:39 pm, Willem Jan Palenstijn w...@usecode.org wrote:
 On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote:

  I tried adding PySys_SetArgv(argc, argv); after Py_Initialize();
  It gets me further but then gives a strange error message:

  Loading the Sage library...

  
  Unhandled SIGSEGV: A segmentation fault occurred in Sage.
  This probably occurred because a *compiled* component
  of Sage has a bug in it (typically accessing invalid memory)
  or is not properly wrapped with _sig_on, _sig_off.
  You might want to run Sage under gdb with 'sage -gdb' to debug this.
  Sage will now terminate (sorry).
  

 I've just tried it here with your embed.c + PySys_SetArgv(argc, argv), and it
 works for me when I link against libpython2.6 dynamically:

 $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6  -lm -lutil 
 -lpthread -ldl -o embed
 $ ./embed
 1+1:
 2
 Load sage
 Factor 2310:
 2 * 3 * 5 * 7 * 11
 $

 This is 64 bit linux with sage 4.7.1rc1.

 -Willem Jan

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