Guido van Rossum added the comment: Oh, I think I understand how this could help STARTTLS. Glyph once explained it to me. STARTTLS takes an existing non-TLS Transport and layers a TLS Transport on top of it. This requires the TLS layer to read/write from the underlying Transport using the standard Transport/Protocol interface (i.e. call transport.write() to write bytes, expect protocol.data_received() to be called when bytes are read). The existing (3.4) ssl module cannot do this because the TLS implementation needs to wrap the socket directly; but (presumably) the BIO-based TLS implementation can do this.
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