python 搜集参数的共有项和所有项

搜集共性项和所有项

###搜集共有参数值
def intersect(*args):
    res=[]
    for x in args[0]:
        for other in args[1:]:
            if x not in other :break
        else:
            res.append(x)
    return res
##搜集所有参数值
def union(*args):
    res=[]
    for seq in args:
        for x in seq:
            if not x in res:
                res.append(x)
    return res 
s1,s2,s3 = "SCAM","SBAM","SDAM"
result=intersect(s1,s2,s3),union(s1,s2,s3)
print(result)

结果
(['S', 'A', 'M'], ['S', 'C', 'A', 'M', 'B', 'D'])