#12746: Another coercion problem with QQbar
-----------------------------+----------------------------------------------
Reporter: davidloeffler | Owner: AlexGhitza
Type: defect | Status: new
Priority: minor | Milestone: sage-5.0
Component: algebra | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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We had a ticket recently for {{{ QQbar(zeta(7)) }}}. Amusingly, {{{
QQbar(zeta(6)) }}} fails in a completely different way:
{{{
sage: QQbar(zeta(6))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (1327, 0))
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/storage/masiao/sage-5.0.beta10/devel/sage-main/<ipython console> in
<module>()
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/structure/parent.so in sage.structure.parent.Parent.__call__
(sage/structure/parent.c:7940)()
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/structure/coerce_maps.so in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_
(sage/structure/coerce_maps.c:3344)()
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/structure/coerce_maps.so in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_
(sage/structure/coerce_maps.c:3247)()
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/rings/qqbar.pyc in _element_constructor_(self, x)
793 return AlgebraicNumber(x._descr)
794 elif hasattr(x, '_algebraic_'):
--> 795 return x._algebraic_(QQbar)
796 return AlgebraicNumber(x)
797
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._algebraic_
(sage/symbolic/expression.cpp:6286)()
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in algebraic(ex, field)
830 0
831 """
--> 832 return AlgebraicConverter(field)(ex)
833
834 ##############
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
212 div = self.get_fake_div(ex)
213 return self.arithmetic(div, div.operator())
--> 214 return self.arithmetic(ex, operator)
215 elif operator in relation_operators:
216 return self.relation(ex, operator)
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in arithmetic(self, ex,
operator)
717 return self.field(base**expt)
718 else:
--> 719 return reduce(operator, map(self, ex.operands()))
720 except TypeError:
721 if operator is _operator.pow:
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
212 div = self.get_fake_div(ex)
213 return self.arithmetic(div, div.operator())
--> 214 return self.arithmetic(ex, operator)
215 elif operator in relation_operators:
216 return self.relation(ex, operator)
/storage/masiao/sage-5.0.beta10/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in arithmetic(self, ex,
operator)
721 if operator is _operator.pow:
722 from sage.symbolic.constants import e, pi, I
--> 723 base, expt = self._operands
724 if base == e and expt / (pi*I) in QQ:
725 return exp(expt)._algebraic_(self.field)
AttributeError: 'AlgebraicConverter' object has no attribute '_operands'
}}}
This is pretty minor -- the conversion is obviously absurd, and all that
needs to be changed is to get it to return a more informative error
message. (Amazing the bugs you can discover from a typo; when I typed {{{
QQbar(zeta(7)) }}} it was a typo for {{{ QQbar.zeta(7) }}} !)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12746>
Sage <http://www.sagemath.org>
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