'''
    python 高级笔记 如何快速找到字典中的公共键
    来源:https://www.bilibili.com/video/BV1b5411s76z?p=5
'''
from functools import reduce
from random import randint, sample
# 生成随机字典

dict01 = {x: randint(0,100) for x in sample("abcdefghij",randint(6,9))}
dict02 = {x: randint(0,100) for x in sample("abcdefghij",randint(6,9))}
dict03 = {x: randint(0,100) for x in sample("abcdefghij",randint(6,9))}
print(dict01)
print(dict02)
print(dict03)

# 方案1 遍历
res = []
for x in dict01:
    if x in dict02 and x in dict03:
        res.append(x)
print(res)

# 方案2 集合交集
res = list(dict01.keys() & dict02.keys() & dict03.keys())
print(res)

# 方案3 map
res = reduce(lambda a, b: a & b, map(dict.keys, [dict01, dict02, dict03]))
print(res)