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More on SF bug [#460020] bug or feature: unicode() and subclasses.

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tuple(i) repaired to return a true tuple when i is an instance of a
tuple subclass.
Added PyTuple_CheckExact macro.
PySequence_Tuple():  if a tuple-like object isn't exactly a tuple, it's
not safe to return the object as-is -- make a new tuple of it instead.
This commit is contained in:
Tim Peters 2001-09-10 23:37:46 +00:00
parent caaff8d95d
commit 4c3a0a35cd
3 changed files with 7 additions and 2 deletions
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6
Objects/abstract.c
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@ -1235,7 +1235,11 @@ PySequence_Tuple(PyObject *v)
return null_error();
/* Special-case the common tuple and list cases, for efficiency. */
if (PyTuple_Check(v)) {
if (PyTuple_CheckExact(v)) {
/* Note that we can't know whether it's safe to return
a tuple *subclass* instance as-is, hence the restriction
to exact tuples here. In contrasts, lists always make
a copy, so there's need for exactness below. */
Py_INCREF(v);
return v;
}