python之列表集合加减与或的计算

import sys
import os
import re

sList = []
dList = []

def getLinesOfFile(fname):
fp = open(fname,"r")
cnt = fp.read()
return re.split(r'\s',cnt)

def SubList(aList,bList):# in a ,not in b
tmp = []
for a in aList:
if a not in bList:
tmp.append(a)
return tmp

def AndList(aList,bList):# in a and in b
tmp = []
for a in aList:
if a in bList:
tmp.append(a)
return tmp

def OrList(aList,bList):# in a or in b
tmp = OnceForList(aList)
bList = OnceForList(bList)
for a in bList:
if a not in tmp:
tmp.append(a)
return tmp

def OnceForList(aList):# ele not repeat in list
tmp = []
for a in aList:
if a not in tmp:
tmp.append(a)
return tmp

def showList(list):
print "len = ",len(list)
print "=============================="
for it in list:
print "item = ",it

sList = getLinesOfFile(sys.argv[1])
dList = getLinesOfFile(sys.argv[2])

showList(SubList(dList,sList))
showList(AndList(dList,sList))