# 我们有两个字典如下:

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

b = {
    "w":10,
    "x":11,
    "y":12
}

# 如果想要得到相同处,只需要用keys和items这类可迭代方法执行集合操作就行

# 大家都有
print(a.keys() & b.keys())

# a有b没有
print(a.keys() - b.keys())

# b有a没有
print(b.keys() - a.keys())

# 想快速给a减键,可以这样:
c = {key:a[key] for key in a.keys() - {"w", "z"}}
print(c)

# python3.9更新了使用|的字典合并和与+=一样的合并运算符|=
d = a
d |= b
print(d)