No module named contact.forms

i'm reading the djangobook, and doing the example(s).
in chapter 7 (forms), when i try to run :

>>> from contact.forms import ContactForm

the shell gives me this error:

Traceback (most recent call last):
File "<console>", line 1, in <module>
ImportError: No module named contact.forms

can you help me to fix this?
thanks

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