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) }