def add_exp(self,gr,exp):
        """Function to add the counts for each sample

        :param gr: name of the sample
        :param exp: counts of sample **gr**

        :returns: dict with key,values equally to name,counts.
        """
        self.group[gr] = exp
        self.total = sum(self.group.values())
Function to add the counts for each sample

        :param gr: name of the sample
        :param exp: counts of sample **gr**

        :returns: dict with key,values equally to name,counts.