- starsfind an image of star make grid of stars appear on the screen - better starsyou can make more realistic star pattern by introducing randomness when you place each star recall that you can get random number like thisfrom random import randint random_number randint(- , this code returns random integer between - and using your code in exercise - adjust each star' position by random amount making the fleet move now let' make our fleet of aliens move to the right across the screen until it hits the edgeand then make it drop set amount and move in the other direction we'll continue this movement until all aliens have been shot downone collides with the shipor one reaches the bottom of the screen let' begin by making the fleet move to the right moving the aliens right to move the alienswe'll use an update(method in alien pywhich we'll call for each alien in the group of aliens firstadd setting to control the speed of each aliensettings py def __init__(self)--snip-alien settings self alien_speed_factor thenuse this setting to implement update()alien py def update(self)"""move the alien right ""self +self ai_settings alien_speed_factor self rect self each time we update an alien' positionwe move it to the right by the amount stored in alien_speed_factor we track the alien' exact position with the self attributewhich can hold decimal values we then use the value of self to update the position of the alien' rect