On Thu, Jan 8, 2015 at 10:16 AM, Андрей Ширшов <sh.andr....@gmail.com> wrote:
> Hello!
> There is the following example on
> http://docs.sympy.org/latest/modules/sets.html:
>
>>>> from sympy import FiniteSet, EmptySet
>>>> A = EmptySet()
>>>> A.powerset()
> {EmptySet()}
>>>> A = FiniteSet(1, 2)
>>>> A.powerset() == FiniteSet(FiniteSet(1), FiniteSet(2), FiniteSet(1, 2),
>>>> EmptySet())
> True
>
>
> If you'll try this code in SMC you will get error, that "'EmptySet' object
> has no attribute 'powerset'". Now in SMC sympy version is 0.7.4,
> while this example seems to be for sympy version 0.7.6
>
> Please update sympy for Sage and SMC.
>
> Best regards, Andrei
I tried pip installing the latest version and it breaks everything
(see below). This request should go to sage-devel, by the way.
/projects/4a5f0542-5873-4eed-a85c-a18c706e8bcd/sage/libs/mpmath/ext_main.pyx
in init sage.libs.mpmath.ext_main
(build/cythonized/sage/libs/mpmath/ext_main.
c:29967)()
/usr/local/sage/sage-6.4/local/lib/python2.7/site-packages/mpmath/__init__.py
in <module>()
4
5 from .ctx_fp import FPContext
----> 6 from .ctx_mp import MPContext
7 from .ctx_iv import MPIntervalContext
8
/usr/local/sage/sage-6.4/local/lib/python2.7/site-packages/mpmath/ctx_mp.py
in <module>()
47 from sage.libs.mpmath.ext_main import Context as BaseMPContext
48 # pickle hack
---> 49 import sage.libs.mpmath.ext_main as _mpf_module
50 else:
51 from .ctx_mp_python import PythonMPContext as BaseMPContext
AttributeError: 'module' object has no attribute 'ext_main'
--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org
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