While going through the docs of pygame, there was a method of pygame called colliderect() that is used to test if two rect objects have overlapped.
colliderect() test if two rectangles overlap
colliderect(Rect) -> bool
Returns true if any portion of either rectangle overlap (except the top+bottom or left+right edges).
In the last line , it said except the top+bottom or left+right
What does this statement mean?
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Answer
It means that the rectangles r1 and r2:
r1 = pygame.Rect(0, 0, 10, 10) r2 = pygame.Rect(10, 0, 10, 10)
are not colliding. r1.colliderect(r2) returns False, even though r1.left + r1.width is equal r2.right.
That is because the r1 covers the (x) region from 0 to 9 (inclusive) and r2 covers the (x) region from 10 to 19 (inclusive).