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Issue #28071: Add early-out for differencing from an empty set.

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This commit is contained in:
Raymond Hettinger 2016-09-11 22:02:28 -07:00
parent 34b74fffb3
commit 4103e4dfbc
2 changed files with 10 additions and 0 deletions
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2
Misc/NEWS
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@ -33,6 +33,8 @@ Core and Builtins
- Issue #28046: Remove platform-specific directories from sys.path.
- Issue #28071: Add early-out for differencing from an empty set.
- Issue #25758: Prevents zipimport from unnecessarily encoding a filename
(patch by Eryk Sun)

8
Objects/setobject.c
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@ -1476,6 +1476,10 @@ PyDoc_STRVAR(isdisjoint_doc,
static int
set_difference_update_internal(PySetObject *so, PyObject *other)
{
if (PySet_GET_SIZE(so) == 0) {
return 0;
}
if ((PyObject *)so == other)
return set_clear_internal(so);
@ -1550,6 +1554,10 @@ set_difference(PySetObject *so, PyObject *other)
Py_ssize_t pos = 0;
int rv;
if (PySet_GET_SIZE(so) == 0) {
return set_copy(so);
}
if (!PyAnySet_Check(other) && !PyDict_CheckExact(other)) {
return set_copy_and_difference(so, other);
}