name = "{:04d}".format(1)

0001

str(name) + ".png"

0001.png

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#python lists
animation_north = []  
animation_south = []  
animation_east = []
animation_west = []

#LOAD 20 IMAGES FROM EACH FOLDER. FILE NAME FORMAT 0001.png
for i in range(1,21):
    name = "{:04d}".format(i) #BLENDER NAME FIX
    path = "assets/north/"+ str(name) +".png"
    animation_north.append(pygame.image.load(path).convert_alpha())
    path = "assets/south/" + str(name) +".png"
    animation_south.append(pygame.image.load(path).convert_alpha())
    path = "assets/east/" + str(name) +".png"
    animation_east.append(pygame.image.load(path).convert_alpha())
    path = "assets/west/" + str(name) +".png"
    animation_west.append(pygame.image.load(path).convert_alpha())

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ANIMATION

self.image_list = animation_south
self.image = self.image_list[self.image_index]      

CHANGE ANIMATION FROM SOUTH TO NORTH

self.image_list = animation_north