>>> lst = [1, 3, 4, 2, 4, 6]
>>> s = [str(i) for i in lst]
>>> s
['1', '3', '4', '2', '4', '6']
>>> s = ' '.join(s)
>>> s
'1 3 4 2 4 6'
>>> tmp = '2 4 6' #template
>>> if tmp in s: s = s.replace(tmp,'')
>>> s
'1 3 4 '
>>> l = s.split(' ')
>>> out = []
>>> for i in l:
	try: out.append(int(i))
	except: pass
>>> out
[1, 3, 4]
>>> 

 >>>l = [1, 3, 4, 7, 2, 4, 6, 9]
>>> delta = []
>>> for i in xrange(1,len(l)): delta.append(l[i] -l[i-1])
>>> delta
[2, 1, 3, -5, 2, 2, 3]
>>>