Python高级编程技巧实战（5）如何快速找到多个字典中的公共键

方法一&＃xff1a;传统方法&＃xff0c;依次遍历

from random import randint, sample# 随机产生 3 场球赛的 进球人和数
s1 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}
s2 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}
s3 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}print(s1)
print(s2)
print(s3)# 传统方法
res &＃61; []for k in s1:if k in s2 and k in s3:res.append(k)print(res)

方法二&＃xff1a;利用集合&＃xff08;set&＃xff09;的交集操作

• 利用字典的keys() 方法&＃xff0c;得到一个字典的 keys 的集合
• 取所有字典的 keys 的集合的交集

from random import randint, sample# 随机产生 3 场球赛的 进球人和数
s1 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}
s2 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}
s3 &＃61; {x: randint(1,4) for x in sample(&＃39;abcdefg&＃39;,randint(3,6))}print(s1)
print(s2)
print(s3)print(s1.keys() & s2.keys() & s3.keys())