Pygame Collision with Changing sprites - python-2.7

Question

Alright,
I've looked everywhere and still can't figure out PyGame collisions. I have two sprites: A lander and a moon surface. The moon is an uneven surface with a transparent background, while the lander is a sprite that changes through images with L,D,UP keypresses.
I'm doing something wrong when it comes to collision detection. Otherwise, everything in my program is going swimmingly
This is my lander class:
class ShipClass(pygame.sprite.Sprite):
def __init__(self, image_file, position):
pygame.sprite.Sprite.__init__(self)
self.imageMaster = pygame.image.load(image_file)
self.image = self.imageMaster
self.rect = self.image.get_rect()
self.mask = pygame.mask.from_surface(self.imageMaster)
self.rect.topleft = position
## This doesn't work
# def checkCollision(self, Mask):
# if Mask.overlap_area
def update(self):
self.rect = self.image.get_rect()
And this is my lunar surface class:
class MoonSurface(pygame.sprite.Sprite):
def __init__(self, image_file, position):
pygame.sprite.Sprite.__init__(self)
self.imageMaster = pygame.image.load(image_file).convert_alpha()
self.image = self.imageMaster
self.rect = self.image.get_rect()
self.rect.topleft = position
What do I need to add to this so that while in my game if the lander hits the moon it sets variable stop to 1 and crash to 1? I plan on also adding landing pads with the MoonSurface class and when it hits them only sets stop to 1.
My sprite is moved as follows:
speed = [0,0]
position = [width-524,height-718]
gravity = 0.05
StartingFuel = 100
done = False
while not done:
event = pygame.event.poll()
if event.type == QUIT:
pygame.quit()
sys.exit(0)
elif event.type == pygame.KEYDOWN:
if event.key == K_ESCAPE:
pygame.quit()
sys.exit(0)
else:
lander = ShipClass('lander.png', position)
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
lander = ShipClass('landerLeft.png', position)
# lander.set_colorkey(BLACK)
speed[0] += 0.3
fuel -= 1
if keys[pygame.K_RIGHT]:
lander = ShipClass('landerRight.png', position)
# lander.set_colorkey(BLACK)
speed[0] -= 0.3
fuel -= 1
if keys[pygame.K_UP]:
lander = ShipClass('landerUp.png', position)
# lander.set_colorkey(BLACK)
speed[1] -= 0.4
fuel -= 1
speed[1] += gravity
position[0] += speed[0]
position[1] += speed[1]
if position[0] < 0:
position[0] = width
elif position[0] > width:
position[0] = 0
screen.blit(lander.image, position)

Answer 1

It looks like you want to check if the two objects overlap. Luckily Pygame has a built- in function colliderect which checks if two rectangles are overlapping. I've put it into a class method here, as I saw your objects had Pygame rectangle variables named rect:
def overlaps (self, other_rect):
return self.rect.colliderect(other_rect)
Here's the documentation: pygame.Rect