def affiche(self):

    r = str(self.coef[0]) + ' '

    for i in range( 1 , len(self.coef) ):

        if i != 1:

            end = '^' + str(i) + ' '

        else:

            end = ' '



        if self.coef[i] < 0:

            r = r + str(self.coef[i]) + 'X' + end

        elif self.coef[i] > 0:

            r = r + '+ ' + str(self.coef[i]) + 'X' 

						+ end



    print(r)