Collective intelligence and Python

I thought  my Boss didn't  increase our development skill.
therefore he don't expect their free will and time anymore.
thus we should spend time to study the search programming.
I'm reading the Collective Intelligence in order to improve the search development skill.
I was hard to read the CI 2 chapter. 
First It was written by Python.
Second It's full of difficult logic . that's very shocking to read.

I should make a decision progress more or less.
It's very difficult decision .

Anyway I  should study the Python Language in order to read rapidly CI.

Today I solve one Python Langage error

recommendation.py Code have error in the Python 3.2

if c%100==0: print "%d / %d" % (c,len(itemPrefs)) ==>
==> if c%100==0: print ("%d / %d" % (c,len(itemPrefs)))

What's different have the two commands ?
Python is very generous and insightful But why upper command have error ?
I didn't know perfect answer.  But I wish to conquer Python.