I'm reading Tutorial on Network Programming with Python, and in this document the author is saying that "The function sendall() should be used only with blocking sockets."
But I do not see any such condition in the Python documentation, socket.sendall(string[, flags]).
Is the author of PyNet right?
When in doubt, check the source.
socket_sendall clearly gives up once send() returns -1, which it will do (with errno of EAGAIN or EWOULDBLOCK) if you call it on a non-blocking socket without calling poll() or select(). (And the internal_select function skips calling poll()/select() when the socket is non-blocking.)
So I would say the PyNet author is correct.
EAGAIN and EWOULDBLOCK ? these can hardly be considered exceptional conditions, imho.sendall() doesn't make sense on non-blocking socket. It has to block if it can't send all data at once, otherwise it wouldn't be called "sendall".
