Mercurial > cpython-lru_cache-weakref

diff Python/bltinmodule.c @ 31345:bb3c3c98cc1b legacy-trunk

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Apply pre-sizing optimization to a broader class of objects. Formerly, the length was only fetched from sequence objects. Now, any object that reports its length can benefit from pre-sizing.
author Raymond Hettinger <python@rcn.com>
date Sun, 04 Jan 2004 11:00:08 +0000
parents 0c1d2062dee3
children 1219f1162d1d
line wrap: on
line diff
--- a/Python/bltinmodule.c	Sun Jan 04 09:58:33 2004 +0000
+++ b/Python/bltinmodule.c	Sun Jan 04 11:00:08 2004 +0000
@@ -153,15 +153,11 @@
 		return NULL;
 
 	/* Guess a result list size. */
-	len = -1;   /* unknown */
-	if (PySequence_Check(seq) &&
-	    seq->ob_type->tp_as_sequence->sq_length) {
-		len = PySequence_Size(seq);
-		if (len < 0)
-			PyErr_Clear();
+	len = PyObject_Size(seq);
+	if (len < 0) {
+		PyErr_Clear();
+		len = 8;	/* arbitrary */
 	}
-	if (len < 0)
-		len = 8;  /* arbitrary */
 
 	/* Pre-allocate argument list tuple. */
 	arg = PyTuple_New(1);