Method do

Lib/test/test_asyncio/test_ssl.py:1112–1123

(func, *args)

                    sslobj = client_sslctx_2.wrap_bio(incoming, outgoing)

                    def do(func, *args):
                        while True:
                            try:
                                rv = func(*args)
                                break
                            except ssl.SSLWantReadError:
                                if outgoing.pending:
                                    sock.send(outgoing.read())
                                incoming.write(sock.recv(65536))
                        if outgoing.pending:
                            sock.send(outgoing.read())
                        return rv

                    do(sslobj.do_handshake)