[pygame] Rect borders

[Lionel barret De Nazaris <lionel.bdn@xxxxxxx>]

Hello all,
I have a question for the community, I am a bit puzzled  :

The last element of a list is the length of the list minus one :

> > > a = range(4)

> > >  a[len(a)-1] == 3

True

But for a rect, the last element of a line is length of the line :

> > > import pygame

> > > a = pygame.Rect(0,0,5,5)

> > > a.right != a.width-1

True 

> > > a.right

5


Why a.right is not 4 (i.e a.width-1 ) ?

recI find this confusing :

> > > a = pygame.Rect(0,0,5,5)

> > > c = a.topleft

> > > b = a.bottomright

> > > a.collidepoint(b)

False

> > > a.collidepoint(c)

True 


I know this is documented but I don't understand the reasons behind this 
behavior.
And I like to understand the stuff that have bitten me. ;)

So, any input ?
L.