[pygame] Pathfinding

[Yanom Mobis <yanom@xxxxxxxxxxxxxx>]

1) How is pathfinding done?
2) How do you prevent a moving sprite from being caught in a v-shaped rut made of obstacles?  Like this:
               __
A          ->  # |      B
               __|  


Where A and B are the points the sprite needs to travel,
# is the sprite,
-> is the direction the sprite is moving, and
_ and | are obstacles?