class TaulerW:

    def __init__(self, nf, nc):
        self.num_files = nf
        self.num_columnes = nc
        self.__wt = [] 

    def afegir_paraula(self, par):
        self.__wt.append(par)

    def __len__(self):
        return len(self.__wt)
    
    def __getitem__(self, i):
        if i < len(self):
            return self.__wt[i]
        else:
            return ''

    def __contains__(self, k):
        for par in self.__wt:
            if k in par:
                return True
        return False