Improve extended slicing support in builtin types and classes. Specifically:
- Specialcase extended slices that amount to a shallow copy the same way as
is done for simple slices, in the tuple, string and unicode case.
- Specialcase step-1 extended slices to optimize the common case for all
involved types.
- For lists, allow extended slice assignment of differing lengths as long
as the step is 1. (Previously, 'l[:2:1] = []' failed even though
'l[:2] = []' and 'l[:2:None] = []' do not.)
- Implement extended slicing for buffer, array, structseq, mmap and
UserString.UserString.
- Implement slice-object support (but not non-step-1 slice assignment) for
UserString.MutableString.
- Add tests for all new functionality.
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 4d4a9ad..f1e3aee 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -603,6 +603,12 @@
if (slicelength <= 0) {
return PyTuple_New(0);
}
+ else if (start == 0 && step == 1 &&
+ slicelength == PyTuple_GET_SIZE(self) &&
+ PyTuple_CheckExact(self)) {
+ Py_INCREF(self);
+ return (PyObject *)self;
+ }
else {
result = PyTuple_New(slicelength);
if (!result) return NULL;