from random import randint,sample
#从'abcdefg'中随机选取几个数字,具体几个由第二个参数决定
sample('abcdefg', randint(3,6) )
s1 = {x:randint(0,4) for x in sample('abcdefg', randint(3,6) ) }
s2 = {x:randint(0,4) for x in sample('abcdefg', randint(3,6) ) }
s3 = {x:randint(0,4) for x in sample('abcdefg', randint(3,6) ) }
第一种方法:
第二种方法:
s1.viewkeys() & s2.viewkeys() & s3.viewkeys()
第三种方法: