python 查找两个字典中相同值

a = { 'x' : 1, 'y' : 2, 'z' : 3 }

b = { 'w' : 10, 'x' : 11, 'y' : 2 }

Find keys in common

a.keys() & b.keys() # { 'x', 'y' }

Find keys in a that are not in b

a.keys() - b.keys() # { 'z' }

Find (key,value) pairs in common

a.items() & b.items() # { ('y', 2) }