hi,

how would u improve this code?

class queue:

def __init__(self, size=

:

self.space = size

self.data = [None]*self.space

self.head = 0

self.tail = 0

self.len = 0

def __len__(self): return self.len

def push(self, x):

if self.len==self.space:

self.data.extend( self.data[:self.tail] )

self.data.extend( [None]* (self.space-self.tail) )

self.tail+=self.space

self.space*=2

self.data[self.tail]=x

self.tail+=1

if self.tail==self.space:

self.tail=0

self.len+=1

def pop(self):

if self.len:

elem = self.data[self.head]

self.head+=1

if self.head==self.space:

self.head=0

return elem

def top(self):

if self.len==0:

raise Exception, 'queue is empty'

return self.data[self.head]

thx in adv.