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Renamed _length_cue() to __length_hint__(). See:

Browse source 
http://mail.python.org/pipermail/python-dev/2006-February/060524.html
This commit is contained in:
Armin Rigo 2006-02-11 21:32:43 +00:00
parent cbcdfdc112
commit f5b3e36493
14 changed files with 41 additions and 32 deletions
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15
Include/abstract.h
View file

@ -422,20 +422,25 @@ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
PyAPI_FUNC(int) PyObject_Length(PyObject *o);
#define PyObject_Length PyObject_Size
PyAPI_FUNC(int) _PyObject_LengthCue(PyObject *o);
PyAPI_FUNC(int) _PyObject_LengthHint(PyObject *o);
/*
Return the size of object o. If the object, o, provides
both sequence and mapping protocols, the sequence size is
returned. On error, -1 is returned. If the object provides
a _length_cue() method, its value is returned. This is the
a __length_hint__() method, its value is returned. This is an
internal undocumented API provided for performance reasons;
for compatibility, don't use it outside the core. This is the
equivalent to the Python expression:
try:
return len(o)
except (AttributeError, TypeError):
if hasattr(o, '_length_cue'):
return o._length_cue()
raise
exc_type, exc_value, exc_tb = sys.exc_info()
try:
return o.__length_hint__()
except:
pass
raise exc_type, exc_value, exc_tb
*/
PyAPI_FUNC(PyObject *) PyObject_GetItem(PyObject *o, PyObject *key);

4
Lib/test/test_iterlen.py
View file

@ -55,7 +55,9 @@ def len(obj):
return _len(obj)
except TypeError:
try:
return obj._length_cue()
# note: this is an internal undocumented API,
# don't rely on it in your own programs
return obj.__length_hint__()
except AttributeError:
raise TypeError

4
Lib/test/test_set.py
View file

@ -607,7 +607,9 @@ def test_iteration(self):
for v in self.set:
self.assert_(v in self.values)
setiter = iter(self.set)
self.assertEqual(setiter._length_cue(), len(self.set))
# note: __length_hint__ is an internal undocumented API,
# don't rely on it in your own programs
self.assertEqual(setiter.__length_hint__(), len(self.set))
def test_pickling(self):
p = pickle.dumps(self.set)

4
Modules/collectionsmodule.c
View file

@ -941,10 +941,10 @@ dequeiter_len(dequeiterobject *it)
return PyInt_FromLong(it->counter);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef dequeiter_methods[] = {
{"_length_cue", (PyCFunction)dequeiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)dequeiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Modules/itertoolsmodule.c
View file

@ -2346,10 +2346,10 @@ repeat_len(repeatobject *ro)
return PyInt_FromLong(ro->cnt);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef repeat_methods[] = {
{"_length_cue", (PyCFunction)repeat_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)repeat_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

6
Objects/abstract.c
View file

@ -82,7 +82,7 @@ PyObject_Length(PyObject *o)
#define PyObject_Length PyObject_Size
int
_PyObject_LengthCue(PyObject *o)
_PyObject_LengthHint(PyObject *o)
{
int rv = PyObject_Size(o);
if (rv != -1)
@ -92,7 +92,7 @@ _PyObject_LengthCue(PyObject *o)
PyObject *err_type, *err_value, *err_tb, *ro;
PyErr_Fetch(&err_type, &err_value, &err_tb);
ro = PyObject_CallMethod(o, "_length_cue", NULL);
ro = PyObject_CallMethod(o, "__length_hint__", NULL);
if (ro != NULL) {
rv = (int)PyInt_AsLong(ro);
Py_DECREF(ro);
@ -1463,7 +1463,7 @@ PySequence_Tuple(PyObject *v)
return NULL;
/* Guess result size and allocate space. */
n = _PyObject_LengthCue(v);
n = _PyObject_LengthHint(v);
if (n < 0) {
if (!PyErr_ExceptionMatches(PyExc_TypeError) &&
!PyErr_ExceptionMatches(PyExc_AttributeError)) {

4
Objects/dictobject.c
View file

@ -2063,10 +2063,10 @@ dictiter_len(dictiterobject *di)
return PyInt_FromLong(len);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef dictiter_methods[] = {
{"_length_cue", (PyCFunction)dictiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)dictiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Objects/enumobject.c
View file

@ -252,10 +252,10 @@ reversed_len(reversedobject *ro)
return PyInt_FromLong((seqsize < position) ? 0 : position);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef reversediter_methods[] = {
{"_length_cue", (PyCFunction)reversed_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Objects/iterobject.c
View file

@ -87,10 +87,10 @@ iter_len(seqiterobject *it)
return PyInt_FromLong(0);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef seqiter_methods[] = {
{"_length_cue", (PyCFunction)iter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)iter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

6
Objects/listobject.c
View file

@ -775,7 +775,7 @@ listextend(PyListObject *self, PyObject *b)
iternext = *it->ob_type->tp_iternext;
/* Guess a result list size. */
n = _PyObject_LengthCue(b);
n = _PyObject_LengthHint(b);
if (n < 0) {
if (!PyErr_ExceptionMatches(PyExc_TypeError) &&
!PyErr_ExceptionMatches(PyExc_AttributeError)) {
@ -2776,10 +2776,10 @@ listiter_len(listiterobject *it)
return PyInt_FromLong(0);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef listiter_methods[] = {
{"_length_cue", (PyCFunction)listiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)listiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Objects/rangeobject.c
View file

@ -268,10 +268,10 @@ rangeiter_len(rangeiterobject *r)
return PyInt_FromLong(r->len - r->index);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef rangeiter_methods[] = {
{"_length_cue", (PyCFunction)rangeiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)rangeiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Objects/setobject.c
View file

@ -758,10 +758,10 @@ setiter_len(setiterobject *si)
return PyInt_FromLong(len);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef setiter_methods[] = {
{"_length_cue", (PyCFunction)setiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)setiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

4
Objects/tupleobject.c
View file

@ -860,10 +860,10 @@ tupleiter_len(tupleiterobject *it)
return PyInt_FromLong(len);
}
PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it)).");
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef tupleiter_methods[] = {
{"_length_cue", (PyCFunction)tupleiter_len, METH_NOARGS, length_cue_doc},
{"__length_hint__", (PyCFunction)tupleiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};

6
Python/bltinmodule.c
View file

@ -220,7 +220,7 @@ builtin_filter(PyObject *self, PyObject *args)
goto Fail_arg;
/* Guess a result list size. */
len = _PyObject_LengthCue(seq);
len = _PyObject_LengthHint(seq);
if (len < 0) {
if (!PyErr_ExceptionMatches(PyExc_TypeError) &&
!PyErr_ExceptionMatches(PyExc_AttributeError)) {
@ -875,7 +875,7 @@ builtin_map(PyObject *self, PyObject *args)
}
/* Update len. */
curlen = _PyObject_LengthCue(curseq);
curlen = _PyObject_LengthHint(curseq);
if (curlen < 0) {
if (!PyErr_ExceptionMatches(PyExc_TypeError) &&
!PyErr_ExceptionMatches(PyExc_AttributeError)) {
@ -2111,7 +2111,7 @@ builtin_zip(PyObject *self, PyObject *args)
len = -1; /* unknown */
for (i = 0; i < itemsize; ++i) {
PyObject *item = PyTuple_GET_ITEM(args, i);
int thislen = _PyObject_LengthCue(item);
int thislen = _PyObject_LengthHint(item);
if (thislen < 0) {
if (!PyErr_ExceptionMatches(PyExc_TypeError) &&
!PyErr_ExceptionMatches(PyExc_AttributeError)) {