code: def unify(self):
          
          length = float(self.norm())
          for row in xrange(self.get_height()):
              self.set_value(0, row, self.get_value(0, row) / length)
          return self
docs: Unifies the vector. The length of the vector will be 1.
  
          :return: Return the instance itself
          :rtype: Vector