#20743: Parent.list() should return an immutable tuple
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Reporter: jsrn | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: categories | Resolution:
Keywords: parent, immutable | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
Alternative idea: create a new type `immutable_list` inheriting from
`list`. This has the advantage of being backwards compatible:
`isinstance(foo, list)` would still be true and the printing would be like
a list. This works and behaves like a `list`:
{{{
cdef class immutable_list(list):
def __setitem__(self, i, value):
raise TypeError
}}}
Of course, you also need to disallow `.append()`, `+=`, `__delitem__`, ...
but the basic idea works.
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Ticket URL: <http://trac.sagemath.org/ticket/20743#comment:7>
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