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bpo-38219: Optimize dict creating and updating by a dict. (GH-16268)

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Serhiy Storchaka 2019-09-25 09:47:00 +03:00 committed by GitHub
parent ad7736faf5
commit f163aeaa8c
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2 changed files with 15 additions and 8 deletions
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2
Misc/NEWS.d/next/Core and Builtins/2019-09-22-13-56-18.bpo-38219.rFl7JD.rst Normal file
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@ -0,0 +1,2 @@
Optimized the :class:`dict` constructor and the :meth:`~dict.update` method
for the case when the argument is a dict.

21
Objects/dictobject.c
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@ -2317,17 +2317,22 @@ dict_update_common(PyObject *self, PyObject *args, PyObject *kwds,
result = -1;
}
else if (arg != NULL) {
_Py_IDENTIFIER(keys);
PyObject *func;
if (_PyObject_LookupAttrId(arg, &PyId_keys, &func) < 0) {
result = -1;
}
else if (func != NULL) {
Py_DECREF(func);
if (PyDict_CheckExact(arg)) {
result = PyDict_Merge(self, arg, 1);
}
else {
result = PyDict_MergeFromSeq2(self, arg, 1);
_Py_IDENTIFIER(keys);
PyObject *func;
if (_PyObject_LookupAttrId(arg, &PyId_keys, &func) < 0) {
result = -1;
}
else if (func != NULL) {
Py_DECREF(func);
result = PyDict_Merge(self, arg, 1);
}
else {
result = PyDict_MergeFromSeq2(self, arg, 1);
}
}
}