STINNER Victor added the comment:
On Python 2, socket.makefile("rb") duplicates the file descriptor and creates a
new file object: fileobj.read() calls the C function read().
On Python 3, socket.makefile("rb") creates a SocketIO wrapped in
BufferedReader: fileobj.read() calls the C function recv() (recvfrom() syscall).
For a UNIX socket, read() is maybe more efficient than recv().
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nosy: +haypo
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<http://bugs.python.org/issue18329>
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