CODE:

    def x_collision(self):
        width = self.rect.width
        height = self.rect.height

        # 移動先の矩形と座標を求めます。
        newx = self.fpx+self.fpvx
        newrect =Rect(newx,self.fpy,width,height)
        for block in self.blocks:
            collide = newrect.colliderect(block.rect)
            if collide:
                if self.fpvx > 0:
                    self.fpx = block.rect.left - width
                    self.fpvx = 0
                elif self.fpvx  0:
                    self.fpy = block.rect.top - height
                    self.fpvy = 0
                elif self.fpvy < 0:
                    self.fpy = block.rect.bottom
                    self.fpvy = 0
                break
            else:
                self.fpy = newy

CODE:

            else:
                self.fpx = newy