(self)
return sum
Returns the total number of observed pathways of any length 
        (includes multiple observations for paths with a frequency weight)
Returns the total number of observed pathways of any length 
        (includes multiple observations for paths with a frequency weight)
Returns the total number of observed pathways of any length ( includes multiple observations for paths with a frequency weight )
def ObservationCount(self):
        """
        Returns the total number of observed pathways of any length 
        (includes multiple observations for paths with a frequency weight)
        """

        sum = 0
        for k in self.paths:
            for p in self.paths[k]:
                sum += self.paths[k][p][1]
        return sum
def ObservationCount ( self ) : sum = 0 for k in self . paths : for p in self . paths [ k ] : sum += self . paths [ k ] [ p ] [ 1 ] return sum