list的交集与差集

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# 交集
b1 = [1, 2, 3]
b2 = [2, 3, 4]
b3 = [val for val in b1 if val in b2]
print b3
# 差集
b4 = [val for val in b1 if val not in b2]
print b4

[2, 3]
[1]