刚学习Python，编写的程序能正常运行，但火箭不能左右移动，如何解决？

刚学习Python，编写的程序能正常运行，但火箭不能左右移动，

#主程序
import sys
import pygame
from hj_image import Hj_image

class Move_huojian:

    def __init__(self):
        pygame.init()

        self.screen=pygame.display.set_mode((1200,600))
        self.screen_name=pygame.display.set_caption("移动火箭")
        self.bj_color=(90,150,190)
        self.hj_image = Hj_image(self)
        #self.hj_speed=0.5

    def _update_screen(self):
        self.screen.fill(self.bj_color)
        self.hj_image.draw_hj()
        pygame.display.flip()

    def _event_key(self):
        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    self.hj_image.move_right == True
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left == True
            elif event.type == pygame.KEYUP:
                if event.type == pygame.K_RIGHT:
                    self.hj_image.move_right == False
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left == False

    def run_game(self):
        while True:
            self._event_key()
            self.hj_image.gengxin()
            self._update_screen()




if __name__=="__main__":
    a=Move_huojian()


#火箭图片模块
import pygame


class Hj_image:

    def __init__(self,hj):
        self.screen=hj.screen
        self.screen_rect=hj.screen.get_rect()

        self.image=pygame.image.load("C:/Users/xcz000/Desktop/My Python/images/arm.bmp")
        self.image_rect=self.image.get_rect()

        #self.x = float(self.image_rect.x)

        self.image_rect.midbottom=self.screen_rect.midbottom

        self.move_right = False
        self.move_left = False

    def gengxin(self):
        if self.move_right:
            self.image_rect.x+=1
        if self.move_left:
            self.image_rect.x-=1

    def draw_hj(self):
        self.screen.blit(self.image,self.image_rect)

有用望采纳
首先，代码中存在一个小错误：

if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    self.hj_image.move_right == True
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left == True
            elif event.type == pygame.KEYUP:
                if event.type == pygame.K_RIGHT:
                    self.hj_image.move_right == False
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left == False

self.hj_image.move_right == True 和 self.hj_image.move_left == False 应该使用赋值语句 = 而不是比较语句 ==。

代码修正后应该是这样的：

if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    self.hj_image.move_right = True
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left = True
            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_RIGHT:
                    self.hj_image.move_right = False
                elif event.key == pygame.K_LEFT:
                    self.hj_image.move_left = False