Zdeněk Pavlas added the comment:
static PyObject*
foo(PyObject *, PyObject *arg)
{
void *buf;
Py_ssize_t size;
if (PyObject_AsReadBuffer(arg, &buf, &size))
size = -1;
return PyInt_FromLong(size);
}
>>> import tst, re
>>> re.search("a", "a")
<_sre.SRE_Match object at 0xb76d0950>
>>> tst.foo("abc")
3
>>> re.search("a", "a")
<_sre.SRE_Match object at 0xb76d0950>
>>> tst.foo(None)
-1
>>> re.search("a", "a")
TypeError: expected a readable buffer object
>>>
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<http://bugs.python.org/issue17544>
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