你要复印一份吗?如果不是，也许你应该使用集合:

>>> set([1, 2, 3, 4, 5]).intersection(set([9, 8, 7, 6, 5]))
set([5])

另一种更实用的方法是检查列表1 (lst1)和列表2 (lst2)是否相等，其中对象的深度为1，并保持顺序:

all(i == j for i, j in zip(lst1, lst2))   

你可以使用

def returnMatches(a,b):
       return list(set(a) & set(b))

你可以使用:

a = [1, 3, 4, 5, 9, 6, 7, 8]
b = [1, 7, 0, 9]
same_values = set(a) & set(b)
print same_values

输出:

set([1, 7, 9])

a = [1, 2, 3, 4, 5]
b = [9, 8, 7, 6, 5]

lista =set(a)
listb =set(b)   
print listb.intersection(lista)   
returnMatches = set(['5']) #output 

print " ".join(str(return) for return in returnMatches ) # remove the set()   

 5        #final output 

you can | for set union and & for set intersection.
for example:

    set1={1,2,3}
    set2={3,4,5}
    print(set1&set2)
    output=3

    set1={1,2,3}
    set2={3,4,5}
    print(set1|set2)
    output=1,2,3,4,5

curly braces in the answer.