Pygame in-place methodes

Question

What are the differences of in_place functions to non-ip ones and why do they exist? When should one use for instance move(),inflate() and when to use

Answer 1

The in place function work, well, in place; they change the Rect you call them on, while the non-in place functions return new instances of the Rect class with the according changes.

You can use them anytime you actually want to change a Rect, e.g. you have a Sprite and want to move it, you can use

s = SomeSpriteClass()
s.rect.move_ip(100, 0)

instead of

s = SomeSpriteClass()
s.rect = s.rect.move(100, 0)

to move the Sprite 100 pixels to the right.

You would use the non-in place functions when you don't want to actually change the Rect, e.g. when you only want to do some calculations, like implementing a camera function.