Re: 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,

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ShenLei
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