@Book{OL3701882M,
    title: {Python cookbook},
    author: {Alex Martelli and David Ascher and David Beazley and Brian K. Jones},
    publisher: {O'Reilly},
    year: {2002},
    place: {Sebastopol, CA},
}

@Book{OL6804857M,
    title: {Learning Python},
    author: {Mark Lutz and David Ascher},
    publisher: {O'Reilly},
    year: {1999},
    place: {Beijing},
}

@Book{OL7581213M,
    title: {Python},
    author: {Mark Lutz},
    publisher: {O’Reilly Media},
    year: {2005},
    place: {Beijing},
}

@Author{OL411267A,
    name: {Mark Lutz},
}