I do not agree. In fact, the insanely cool examples are what makes this book worth reading. This book is not for beginners but for programmers who have experience in some other language and are curious to know why python might be a better choice for them as their next high level language.

in fact to reiterate have a look at the awesome fibonacci example showing power of generators [1]:

    def fibonacci(max):
        a, b = 0, 1       
        while a < max:
            yield a       
            a, b = b, a+b

To run the function do:

    >>> for n in fibonacci(1000): 
    ...     print n,              
    0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987

[1] http://diveintopython.org/dynamic_functions/stage6.html

That is, at best, a very high-level 'why', and unnecessarily hostile.