very rare python expression

[Alexandru Palade]

Nothing strange about that syntax (though some spaces might helped you out).

The '&' operator is a bit-wise operator
(http://docs.python.org/ref/bitwise.html).

甜瓜 wrote:
> Howdy everyone,
>
> I saw a strange python code in pygame project. What does "while
> not(x&528or x in l):" mean? Below code works in python2.5, so "x&528"
> is not HTML strings.
>
> # snake.py code:
> import pygame as p,random
> p.init()
> q=p.display
> T=16
> b=q.set_mode([256]*2).fill
> l=[]
> d=a=x=1
> c=p.event.get
> while not(x&528or x in l):
>  l=l[a!=x:]+[x]
>  while a&528or a in l:a=random.randrange(512)
>  b(0)
>  [b(99,(o%T*T,o/32*T,T,T))for o in l+[a]]
>  q.flip()
>  p.time.wait(199)
>  for e in c(2):
>   v=e.key-272
>   n=((v&2)-1)*[1,32][v<3]
>   if-n-d and 0<v<5:d=n
>  c()
>  x=l[-1]+d
>
>
> Best regards,
>
> --
> ShenLei
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>