#10800: typo in Sequence
-----------------------------+----------------------------------------------
Reporter: dsm | Owner: tbd
Type: defect | Status: new
Priority: trivial | Milestone:
Component: PLEASE CHANGE | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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If you try to hash a mutable sequence, Sage complains that immutable
sequences are unhashable..
{{{
sage: hash(a)
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/Applications/sage_devel/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-
packages/sage/structure/sequence.pyc in __hash__(self)
517 """
518 if not self._is_immutable:
--> 519 raise ValueError, "immutable sequences are unhashable"
520 if self.__hash is None:
521 self.__hash = hash(tuple(self))
ValueError: immutable sequences are unhashable
}}}
which is backwards; immutable sequences are the only ones that are
hashable.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10800>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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