1、

>>> a = ["aaa","bbb","ccc","ddd"]
>>> b = ["ccc","ddd","eee","fff"]
>>> c = a + b
>>> c
[\'aaa\', \'bbb\', \'ccc\', \'ddd\', \'ccc\', \'ddd\', \'eee\', \'fff\']
>>> d = []
>>> for i in c:
    if c.count(i) >= 2:
        d.append(i)

        
>>> d
[\'ccc\', \'ddd\', \'ccc\', \'ddd\']
>>> d = list(set(d))
>>> d          ## 交集
[\'ccc\', \'ddd\']
>>> e = list(set(c))
>>> e          ## 并集
[\'ccc\', \'fff\', \'bbb\', \'eee\', \'aaa\', \'ddd\']

 

2、

>>> a = ["aaa","bbb","ccc","ddd"]
>>> b = ["ccc","ddd","eee","fff"]
>>> c = []
>>> for i in a:
    if i in b:
        c.append(i)

        
>>> c
[\'ccc\', \'ddd\']
>>> c = list(set(c))
>>> c     ##交集
[\'ccc\', \'ddd\']
>>> d = []
>>> for i in a:
    if i not in b:
        d.append(i)

        
>>> d
[\'aaa\', \'bbb\']
>>> e = d + b
>>> e
[\'aaa\', \'bbb\', \'ccc\', \'ddd\', \'eee\', \'fff\']
>>> e = list(set(e))
>>> e      ## 并集
[\'ccc\', \'aaa\', \'eee\', \'ddd\', \'fff\', \'bbb\']

 

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