あなたはPythonの基本を学びたいと思っているので、これを行うためのいくつかの異なる方法を紹介します(Pythonの「それを行うための明白な方法は1つ、できれば1つだけでなければなりません」):
for item in tails:
xposition = item[1] # get item by index
yposition = item[2]
pygame.draw.rect(windowSurface, RED, (xposition, yposition, 16, 16))
また
for item in tails:
( xposition, yposition ) = item[1:] # tuple assignment
pygame.draw.rect(windowSurface, RED, (xposition, yposition, 16, 16))
また
for tail_num, xposition, yposition in tails: # tuple assignment in for-loop
pygame.draw.rect(windowSurface, RED, (xposition, yposition, 16, 16))
また
# prepare args using list comprehension
rect_args_list = [ tuple(item[1:]) + ( 16, 16) for item in tails ]
for rect_args in rect_args_list:
pygame.draw.rect(windowSurface, RED, rect_args)