#10113: Calling seed() incorrectly causes Sage to crash with SIGSEGV
(Segmentation
Fault)
------------------------------+---------------------------------------------
Reporter: drkirkby | Owner: jason
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: misc | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: | Stopgaps:
------------------------------+---------------------------------------------
Comment (by SimonKing):
Replying to [comment:9 cremona]:
> which are similar in so far as they are reporting invalid input to a
constructor.
These examples are totally different, actually. In your example, the
functions or methods are called, and then ''inside the function/method''
the arguments are checked and an error is raised. In my example, Python
tests whether the number of arguments is correct, which is not the case,
and thus the error is raised ''before the method is called''.
More differences:
When you do `EllipticCurve([1])` you are calling a function
{{{
sage: type(EllipticCurve)
<type 'function'>
}}}
and the function accepts anything between 1 and 3 arguments. Compare:
{{{
sage: EllipticCurve(1,2,3,4)
Traceback (most recent call last)
...
TypeError: EllipticCurve() takes at most 3 arguments (4 given)
}}}
When you call `ZZ(x)`, then you are calling the `__call__` method of `ZZ`,
which accepts any number of arguments:
{{{
sage: from sage.misc.sageinspect import sage_getargspec
sage: sage_getargspec(ZZ)
ArgSpec(args=['self', 'x', '*args', '**kwds'], varargs=None,
keywords=None, defaults=(0,))
}}}
However, in my example, a class is called. So, that would be something
like
{{{
sage: ZZ.__class__(x)
Traceback (most recent call last)
...
TypeError: __init__() takes exactly 0 positional arguments (1 given)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10113#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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