\author{Guido van Rossum} \authoraddress{ Corporation for National Research Initiatives (CNRI) \\ 1895 Preston White Drive, Reston, Va 20191, USA \\ E-mail: \email{guido@CNRI.Reston.Va.US}, \email{guido@python.org} } \date{July 28, 1998} % XXX update before release! \release{1.5.1}