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.)
Use bit fields for flags to reduce memory usage.
Return booleans where they are documented. Although a boolean for
seekable seems a bit odd when it can be unknown. Add a comment about this.
api functions. Code from fileobject.c, patch by Amaury Forgeot d'Arc.
This patch also changes:
The return value of the native ftruncate function is checked for '!=
0' instead of '< 0' as before.
fileio_seekable returns bool now instead of an int.
to even the most basic file object (I also added readall() which may
be a better API). Also, not all the tests requiring specific failure
modes could be saved. And there were the usual str/bytes issues.
I made sure test_io.py still passes (io.py is now most thoroughly
tested by combining test_file.py and test_io.py).
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.
Fix the truncate() semantics -- it should not affect the current position.
Switch wave.py/chunk.py to struct.unpack_from() to support bytes.
Don't use writelines() on binary files (test_fileinput.py).
write() returns the number of bytes/characters written/buffered.
FileIO.close() calls self.flush().
Implement readinto() for buffered readers.
Tests th check all these.
Test proper behavior of __enter__/__exit__.
