#14231: warn when preparser redefines Python builtin function
------------------------------+---------------------------------------------
Reporter: ddrake | Owner: was
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.8
Component: user interface | Keywords: symbolic preparser builtin
built-in
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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At https://groups.google.com/forum/?fromgroups=#!topic/sage-
devel/EQzNB7vkN3o , a user tries this:
{{{
sage: t=(1,2,3)
sage: type(t)
tuple
sage: len(t)
3
sage: len(t)=4
sage: t
t
sage: type(t)
sage.symbolic.expression.Expression
}}}
This strange behavior is because of the preparser:
{{{
sage: preparse('len(t) = 4')
'__tmp__=var("t"); len = symbolic_expression(Integer(4)).function(t)'
}}}
I propose that when the preparser is about to redefine a Python built-in
function, we issue a warning. This will allow users to clobber the
builtins, but also tell them they are possibly doing something unwise.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14231>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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