#8478: Programming tutorial page seems incorrect
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Reporter: lesshaste | Owner: mvngu
Type: defect | Status: new
Priority: major | Milestone:
Component: documentation | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by edgimar:
Old description:
> The section Standalone Python/Sage Scripts at
> http://www.sagemath.org/doc/tutorial/programming.html#section-loadattach
> seems to have two problems (profuse apologies if these are actually user
> errors).
>
> 1) #!/usr/bin/env sage -python doesn't work in linux as shebang can't
> take two arguments. One simple workaround is to use #!/path_to_sage
> -python
> 2) The script itself seems broken. Testing it using sage 4.3.3
>
> ./factor 2006
>
> works as expected.
>
> But ./factor "32*x^5-1" gives
> Traceback (most recent call last):
> File "./factor", line 11, in <module>
> print factor(sage_eval(sys.argv[1]))
> File "/opt/sage-4.3.3-linux-32bit-
> ubuntu_9.10-i686-Linux/local/lib/python2.6/site-
> packages/sage/misc/sage_eval.py", line 199, in sage_eval
> return eval(source, sage.all.__dict__, locals)
> File "<string>", line 1, in <module>
> NameError: name 'x' is not defined
New description:
The section Standalone !Python/Sage Scripts at
http://www.sagemath.org/doc/tutorial/programming.html#section-loadattach
seems to have two problems (profuse apologies if these are actually user
errors).
1. __`#!/usr/bin/env sage -python`__ doesn't work in linux since a shebang
line can only handle a single argument ('sage' in this case). One
workaround is to use __`#!/path/to/sage -python`__ -- I have since
verified, however, that simply using __`#!/usr/bin/env sage`__ **does**
work with sage 5.8.
2. The script itself seems broken. When testing it using sage 4.3.3 (and
5.8), running __`./factor 2006`__ works as expected, but __`./factor
"32*x^5-1"`__ gives:
{{{
Traceback (most recent call last):
File "./factor", line 11, in <module>
print factor(sage_eval(sys.argv[1]))
File "/opt/sage-4.3.3-linux-32bit-
ubuntu_9.10-i686-Linux/local/lib/python2.6/site-
packages/sage/misc/sage_eval.py", line 199, in sage_eval
return eval(source, sage.all.__dict__, locals)
File "<string>", line 1, in <module>
NameError: name 'x' is not defined
}}}
To correct this, see the comment attached to this ticket which provides a
new version of the 'factor' script.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8478#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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