#17097: Don't use "is" with strings
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: misc | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> There are surprisingly many places in Sage where strings are compared
> with `is` instead of `==`. This actually works in simple cases:
> {{{
> sage: "foo" is "foo"
> True
> sage: "foo" is "foox"[:3]
> False
> sage: "foo" == "foox"[:3]
> True
> }}}
New description:
There are surprisingly many places in Sage where strings are compared with
`is` instead of `==`. This actually works in simple cases:
{{{
sage: "foo" is "foo"
True
sage: "foo" is "foox"[:3]
False
sage: "foo" == "foox"[:3]
True
}}}
In `src/sage/combinat/root_system/branching_rules.py`, this requires a fix
to `BranchingRule.__cmp__()` since `BranchingRule` objects need to be
compared to strings.
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Ticket URL: <http://trac.sagemath.org/ticket/17097#comment:1>
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