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file_getiter(): make iter(file) be equivalent to file.xreadlines().

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This should be faster.

This means:

(1) "for line in file:" won't work if the xreadlines module can't be
    imported.

(2) The body of "for line in file:" shouldn't use the file directly;
    the effects (e.g. of file.readline(), file.seek() or even
    file.tell()) would be undefined because of the buffering that goes
    on in the xreadlines module.
This commit is contained in:
Guido van Rossum 2001-05-22 16:48:37 +00:00
parent d992c2c74d
commit 5b021848ac
1 changed files with 3 additions and 12 deletions
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15
Objects/fileobject.c
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@ -1298,18 +1298,9 @@ file_setattr(PyFileObject *f, char *name, PyObject *v)
}
static PyObject *
file_getiter(PyFileObject *f)
file_getiter(PyObject *f)
{
static PyObject *es;
PyObject *iter;
PyObject *rl = Py_FindMethod(file_methods, (PyObject *)f, "readline");
if (rl == NULL)
return NULL;
if (es == NULL)
es = PyString_FromString("");
iter = PyCallIter_New(rl, es);
Py_DECREF(rl);
return iter;
return PyObject_CallMethod(f, "xreadlines", "");
}
PyTypeObject PyFile_Type = {
@ -1339,7 +1330,7 @@ PyTypeObject PyFile_Type = {
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
(getiterfunc)file_getiter, /* tp_iter */
file_getiter, /* tp_iter */
0, /* tp_iternext */
};