Should make percent_difference accept integers instead of TextSample object

[jmcrey]

def percent_difference(sample1, sample2): 
    v1 = sample1.average_sentence_length
    v2 = sample2.average_sentence_length

    #Calculate and return according to the formula (v1 - v2) / ((v1 + v2)/2)
    return abs(v1 - v2) / ((v1 + v2)/2)

Really nice job with this function! The only thing I might change about this function is that it should accept an integer instead of the TextSample object so that the function can be used for non-TextSample objects. By changing this funciton to accept an integer it can be used for other purposes except for this project, thus making it more flexible. Of course, this approach is perfect for the purposes of this project, so it is perfectly acceptable. Just a suggestion.