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accept None as the same as having passed no argument in file types #7349 

This is for consistency with imitation file objects like StringIO and BytesIO.

This commit also adds a few tests, where they were lacking for concerned
methods.
This commit is contained in:
Benjamin Peterson 2009-12-13 19:19:07 +00:00
parent e304852e21
commit ddd392cbb9
9 changed files with 77 additions and 29 deletions
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9
Lib/test/test_fileio.py
View File

@ -71,6 +71,15 @@ class AutoFileTests(unittest.TestCase):
n = self.f.readinto(a)
self.assertEquals(array(b'b', [1, 2]), a[:n])
def test_none_args(self):
self.f.write(b"hi\nbye\nabc")
self.f.close()
self.f = _FileIO(TESTFN, 'r')
self.assertEqual(self.f.read(None), b"hi\nbye\nabc")
self.f.seek(0)
self.assertEqual(self.f.readline(None), b"hi\n")
self.assertEqual(self.f.readlines(None), [b"bye\n", b"abc"])
def testRepr(self):
self.assertEquals(repr(self.f), "<_io.FileIO name=%r mode='%s'>"
% (self.f.name, self.f.mode))

36
Lib/test/test_io.py
View File

@ -341,7 +341,7 @@ class IOTest(unittest.TestCase):
self.assertEqual(f.readline(2), b"xy")
self.assertEqual(f.readline(4), b"zzy\n")
self.assertEqual(f.readline(), b"foo\x00bar\n")
self.assertEqual(f.readline(), b"another line")
self.assertEqual(f.readline(None), b"another line")
self.assertRaises(TypeError, f.readline, 5.3)
with self.open(support.TESTFN, "r") as f:
self.assertRaises(TypeError, f.readline, 5.3)
@ -654,9 +654,10 @@ class BufferedReaderTest(unittest.TestCase, CommonBufferedTests):
self.assertEquals(b"abc", bufio.read())
def test_read(self):
rawio = self.MockRawIO((b"abc", b"d", b"efg"))
bufio = self.tp(rawio)
self.assertEquals(b"abcdef", bufio.read(6))
for arg in (None, 7):
rawio = self.MockRawIO((b"abc", b"d", b"efg"))
bufio = self.tp(rawio)
self.assertEquals(b"abcdefg", bufio.read(arg))
# Invalid args
self.assertRaises(ValueError, bufio.read, -2)
@ -673,6 +674,7 @@ class BufferedReaderTest(unittest.TestCase, CommonBufferedTests):
self.assertEquals(b"efg", bufio.read1(100))
self.assertEquals(rawio._reads, 3)
self.assertEquals(b"", bufio.read1(100))
self.assertEquals(rawio._reads, 4)
# Invalid args
self.assertRaises(ValueError, bufio.read1, -1)
@ -691,6 +693,14 @@ class BufferedReaderTest(unittest.TestCase, CommonBufferedTests):
self.assertEquals(bufio.readinto(b), 0)
self.assertEquals(b, b"gf")
def test_readlines(self):
def bufio():
rawio = self.MockRawIO((b"abc\n", b"d\n", b"ef"))
return self.tp(rawio)
self.assertEquals(bufio().readlines(), [b"abc\n", b"d\n", b"ef"])
self.assertEquals(bufio().readlines(5), [b"abc\n", b"d\n"])
self.assertEquals(bufio().readlines(None), [b"abc\n", b"d\n", b"ef"])
def test_buffering(self):
data = b"abcdefghi"
dlen = len(data)
@ -1131,6 +1141,14 @@ class BufferedRWPairTest(unittest.TestCase):
self.assertEqual(pair.read(3), b"abc")
self.assertEqual(pair.read(1), b"d")
self.assertEqual(pair.read(), b"ef")
pair = self.tp(self.BytesIO(b"abc"), self.MockRawIO())
self.assertEqual(pair.read(None), b"abc")
def test_readlines(self):
pair = lambda: self.tp(self.BytesIO(b"abc\ndef\nh"), self.MockRawIO())
self.assertEqual(pair().readlines(), [b"abc\n", b"def\n", b"h"])
self.assertEqual(pair().readlines(), [b"abc\n", b"def\n", b"h"])
self.assertEqual(pair().readlines(5), [b"abc\n", b"def\n"])
def test_read1(self):
# .read1() is delegated to the underlying reader object, so this test
@ -1781,6 +1799,8 @@ class TextIOWrapperTest(unittest.TestCase):
self.assertEquals(f.read(), "abc")
cookie = f.tell()
self.assertEquals(f.seek(0), 0)
self.assertEquals(f.read(None), "abc")
f.seek(0)
self.assertEquals(f.read(2), "ab")
self.assertEquals(f.read(1), "c")
self.assertEquals(f.read(1), "")
@ -1951,6 +1971,14 @@ class TextIOWrapperTest(unittest.TestCase):
reads += c
self.assertEquals(reads, "AA\nBB")
def test_readlines(self):
txt = self.TextIOWrapper(self.BytesIO(b"AA\nBB\nCC"))
self.assertEqual(txt.readlines(), ["AA\n", "BB\n", "CC"])
txt.seek(0)
self.assertEqual(txt.readlines(None), ["AA\n", "BB\n", "CC"])
txt.seek(0)
self.assertEqual(txt.readlines(5), ["AA\n", "BB\n"])
# read in amounts equal to TextIOWrapper._CHUNK_SIZE which is 128.
def test_read_by_chunk(self):
# make sure "\r\n" straddles 128 char boundary.

4
Misc/NEWS
View File

@ -20,6 +20,10 @@ Core and Builtins
Library
-------
- Issue #7349: Make methods of file objects in the io module accept None as an
argument where file-like objects (ie StringIO and BytesIO) accept them to mean
the same as passing no argument.
- Issue #7348: StringIO.StringIO.readline(-1) now acts as if it got no argument
like other file objects.

23
Modules/_io/_iomodule.c
View File

@ -573,6 +573,29 @@ PyNumber_AsOff_t(PyObject *item, PyObject *err)
}
/* Basically the "n" format code with the ability to turn None into -1. */
int
_PyIO_ConvertSsize_t(PyObject *obj, void *result) {
Py_ssize_t limit;
if (obj == Py_None) {
limit = -1;
}
else if (PyNumber_Check(obj)) {
limit = PyNumber_AsSsize_t(obj, PyExc_OverflowError);
if (limit == -1 && PyErr_Occurred())
return 0;
}
else {
PyErr_Format(PyExc_TypeError,
"integer argument expected, got '%.200s'",
Py_TYPE(obj)->tp_name);
return 0;
}
*((Py_ssize_t *)result) = limit;
return 1;
}
/*
* Module definition
*/

3
Modules/_io/_iomodule.h
View File

@ -19,6 +19,9 @@ extern PyTypeObject PyBufferedRandom_Type;
extern PyTypeObject PyTextIOWrapper_Type;
extern PyTypeObject PyIncrementalNewlineDecoder_Type;
extern int _PyIO_ConvertSsize_t(PyObject *, void *);
/* These functions are used as METH_NOARGS methods, are normally called
* with args=NULL, and return a new reference.
* BUT when args=Py_True is passed, they return a borrowed reference.

18
Modules/_io/bufferedio.c
View File

@ -720,7 +720,7 @@ buffered_read(buffered *self, PyObject *args)
PyObject *res;
CHECK_INITIALIZED(self)
if (!PyArg_ParseTuple(args, "|n:read", &n)) {
if (!PyArg_ParseTuple(args, "|O&:read", &_PyIO_ConvertSsize_t, &n)) {
return NULL;
}
if (n < -1) {
@ -950,25 +950,11 @@ end_unlocked:
static PyObject *
buffered_readline(buffered *self, PyObject *args)
{
PyObject *limitobj = NULL;
Py_ssize_t limit = -1;
CHECK_INITIALIZED(self)
if (!PyArg_ParseTuple(args, "|O:readline", &limitobj)) {
if (!PyArg_ParseTuple(args, "|O&:readline", &_PyIO_ConvertSsize_t, &limit))
return NULL;
}
if (limitobj) {
if (!PyNumber_Check(limitobj)) {
PyErr_Format(PyExc_TypeError,
"integer argument expected, got '%.200s'",
Py_TYPE(limitobj)->tp_name);
return NULL;
}
limit = PyNumber_AsSsize_t(limitobj, PyExc_OverflowError);
if (limit == -1 && PyErr_Occurred())
return NULL;
}
return _buffered_readline(self, limit);
}

2
Modules/_io/fileio.c
View File

@ -599,7 +599,7 @@ fileio_read(fileio *self, PyObject *args)
if (!self->readable)
return err_mode("reading");
if (!PyArg_ParseTuple(args, "|n", &size))
if (!PyArg_ParseTuple(args, "|O&", &_PyIO_ConvertSsize_t, &size))
return NULL;
if (size < 0) {

9
Modules/_io/iobase.c
View File

@ -455,7 +455,7 @@ iobase_readline(PyObject *self, PyObject *args)
PyObject *buffer, *result;
Py_ssize_t old_size = -1;
if (!PyArg_ParseTuple(args, "|n:readline", &limit)) {
if (!PyArg_ParseTuple(args, "|O&:readline", &_PyIO_ConvertSsize_t, &limit)) {
return NULL;
}
@ -579,14 +579,9 @@ iobase_readlines(PyObject *self, PyObject *args)
Py_ssize_t hint = -1, length = 0;
PyObject *hintobj = Py_None, *result;
if (!PyArg_ParseTuple(args, "|O:readlines", &hintobj)) {
if (!PyArg_ParseTuple(args, "|O&:readlines", &_PyIO_ConvertSsize_t, &hint)) {
return NULL;
}
if (hintobj != Py_None) {
hint = PyNumber_AsSsize_t(hintobj, PyExc_ValueError);
if (hint == -1 && PyErr_Occurred())
return NULL;
}
result = PyList_New(0);
if (result == NULL)

2
Modules/_io/textio.c
View File

@ -1455,7 +1455,7 @@ textiowrapper_read(textio *self, PyObject *args)
CHECK_INITIALIZED(self);
if (!PyArg_ParseTuple(args, "|n:read", &n))
if (!PyArg_ParseTuple(args, "|O&:read", &_PyIO_ConvertSsize_t, &n))
return NULL;
CHECK_CLOSED(self);