insert tuples through copy

Hello:
Im trying to insert tuples through the copy sql like
this:

curs.execute('copy tablename from stdin;')
curs.execute('2\t3\4\n')

I get an error:
    self.res = self.conn.conn.query(_qstr)
libpq.ProgrammingError: COPY state must be terminated
first

I can't find the way to send the tuples string.

In C you can do the following:

PQexec(conn,"copy foo from stdin");
PQputline(conn,"3\t4\n");
PQputline(conn,"\\.\n";
PQendcopy(conn);


How can this be done with PgSQL??



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