Generate a list of strings with a sliding window using itertools, yield, and iter() in Python 2.7.1?

Question

I\'m trying to generate a sliding window function in Python. I figured out how to do it but not all inside the function. itertools, yield, and iter() are entirely new to me

Answer 1

def window(fseq,fn):
    alpha=[fseq[i:i+fn] for i in range(len(fseq)-(fn-1))]
    return alpha