Class Weight

pattern/metrics.py:353–368

A float with a magic "assessments" property, which is the set of all n-grams contributing to the weight.

    return [tuple(s[i:i+n]) for i in range(len(s)-n+1)]

class Weight(float):
    """ A float with a magic "assessments" property,
        which is the set of all n-grams contributing to the weight.
    """
    def __new__(self, value=0.0, assessments=[]):
        return float.__new__(self, value)
    def __init__(self, value=0.0, assessments=[]):
        self.assessments = set(assessments)
    def __iadd__(self, value):
        return Weight(self + value, self.assessments)
    def __isub__(self, value):
        return Weight(self - value, self.assessments)
    def __imul__(self, value):
        return Weight(self * value, self.assessments)
    def __idiv__(self, value):
        return Weight(self / value, self.assessments)

def intertextuality(texts=[], n=5, continuous=False, weight=lambda ngram: 1):
    """ Returns a dictionary of (i, j) => float.