Python for software design

Bibtex entry :

@book { Downey2009,
    author = { Downey, Allen B. },
    title = { Python for software design },
    publisher = { Cambridge University Press },
    year = { 2009 },
    url = { http://www.greenteapress.com/thinkpython/ },
    annote = { An unusual textbook. Worth of reading. It may speed up starting programming essentially. },
}