#16971: Notebook does not complain on assignment to literal
-------------------------+-------------------------------------------------
Reporter: gagern | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: notebook | Keywords: assignment silent syntax
Merged in: | preparse
Reviewers: | Authors:
Work issues: | Report Upstream: N/A
Commit: | Branch:
Stopgaps: | Dependencies:
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In the sage notebook (from Sage 6.2) I can write the following things
without seeing an exception:
{{{
1 = 2
foo = 1 = 2
}}}
On the command line, these correctly complain:
{{{
sage: 1 = 2
ValueError: The name "1" is not a valid Python identifier.
sage: foo = 1 = 2
SyntaxError: can't assign to function call
}}}
But in the notebook, these apparently get executed, since at the end the
variable `foo` has the value `2`. So it seems that the notebook does more
than `preparse` indicates. I see no modification of global literals, but
even so silently ignoring such errors seems like pretty bad style.
Particular since proffesional mathematicians but novice programmers might
tend to place `=` signs in places we don't expect them to.
--
Ticket URL: <http://trac.sagemath.org/ticket/16971>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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