After a long discussion about the problem with Windows GUI apps Guido decided that sys.stdin, stdout and stderr should be None when the C runtime library returns invalid file descriptors for the standard streams.
So far the only known cases are Windows GUI apps and scripts started with pythonw on Windows. The OS restrictions are tight enough to catch the problem on other OSes.
Added some more methods and attributes to stdprinter to ease up debugging #1415 on Windows. It also makes the object more file like. Now it can be used as a working replacement for an io instance.
On Windows fileno(stdout) and fileno(stderr) can return an invalid file descriptor number (-2 on my machine). It happens only for pythonw.exe but not for python.exe.
Catch the problem ASAP in PyFile_NewStdPrinter(). I've also removed the call to PyErr_BadInternalCall(). It was causing a seg fault because the exceptions aren't available yet.
No detailed change log; just check out the change log for the py3k-pep3137
branch. The most obvious changes:
- str8 renamed to bytes (PyString at the C level);
- bytes renamed to buffer (PyBytes at the C level);
- PyString and PyUnicode are no longer compatible.
I.e. we now have an immutable bytes type and a mutable bytes type.
The behavior of PyString was modified quite a bit, to make it more
bytes-like. Some changes are still on the to-do list.
Before sys.stderr is set to the proper thing, set it to a really simple
file-like object that can print tracebacks using direct file descriptor I/O.
This is handy for debugging.
Add a closefd flag to open() which can be set to False to prevent closing
the file descriptor when close() is called or when the object is destroyed.
Useful to ensure that sys.std{in,out,err} keep their file descriptors open
when Python is uninitialized. (This was always a feature in 2.x, it just
wasn't implemented in 3.0 yet.)
Additional patch by Christian Heimes to deal more cleanly with the
FILE* vs file-descriptor issues.
I cleaned up his code a bit, and moved the lseek() call into import.c.
to 'file', and fix a bunch of subtleties in the behavior of objects
related to overriding __str__. Also disabled a few tests that I couldn't
see how to fix but that seemed to be checking silly stuff only.
Fixed test_import.py while I was at it.
However, there's still a problem in import.c -- get_file() can leak a
FILE struct (not a file descriptor though). I'm not sure how to fix
this; closing the FILE* closes the file descriptor, and that's the
wrong thing to do when there's still a Python file object keeping the
file descriptor open. I also would rather not mess with dup(), as it
won't port to Windows.
PyString_Concat() and PyString_ConcatAndDel() (the name PyUnicode_Concat()
was already taken).
Change PyObject_Repr() to always return a unicode object.
Update all repr implementations to return unicode objects.
Add a function PyObject_ReprStr8() that calls PyObject_Repr() and converts
the result to an 8bit string.
Use PyObject_ReprStr8() where using PyObject_Repr() can't be done
straightforward.
