Hello,
io.RawIOBase.read() is well specified for behavior in case it
immediately gets a would-block condition: "If the object is in
non-blocking mode and no bytes are available, None is returned."
(https://docs.python.org/3/library/io.html#io.RawIOBase.read).
However, nothing is said about such condition for io.IOBase.readline(),
which is mixin method in a base class, default implementation of which
thus would use io.RawIOBase.read(). Looking at 3.4.0 source, iobase.c:
iobase_readline() has:
b = _PyObject_CallMethodId(self, &PyId_read, "n", nreadahead);
[...]
if (!PyBytes_Check(b)) {
PyErr_Format(PyExc_IOError,
"read() should have returned a bytes object, "
"not '%.200s'", Py_TYPE(b)->tp_name);
I.e. it's not even ready to receive legitimate return value of None
from read(). I didn't try to write a testcase though, so may be missing
something.
So, how readline() should behave in this case, and can that be
specified in the Library Reference?
Thanks,
Paul mailto:pmis...@gmail.com
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