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The empty tuple is usually a singleton with a much higher refcnt than 1

This commit is contained in:
Christian Heimes 2008-02-28 11:18:49 +00:00
parent 18750ab2a0
commit cdddf18768
1 changed files with 5 additions and 2 deletions
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7
Modules/itertoolsmodule.c
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@ -2111,8 +2111,11 @@ combinations_next(combinationsobject *co)
} }
Py_DECREF(old_result); Py_DECREF(old_result);
} }
/* Now, we've got the only copy so we can update it in-place */ /* Now, we've got the only copy so we can update it in-place
assert (Py_REFCNT(result) == 1); * CPython's empty tuple is a singleton and cached in
* PyTuple's freelist.
*/
assert(r == 0 || Py_REFCNT(result) == 1);
/* Scan indices right-to-left until finding one that is not /* Scan indices right-to-left until finding one that is not
at its maximum (i + n - r). */ at its maximum (i + n - r). */