python 代码求list集合交并差、随机生成字符串

import random

print("随机生成n个0-30随机数的数组：")
def randlist(n):
    return [random.randint(0,30) for i in range(n)]


def main():
    a=randlist(10)
    b=randlist(20)

    print(a)
    print(b)

    print("去重并集：")
    c=list(set(a).union(set(b)))
    print(c)

    print("去重交集：")
    d=list(set(a).intersection(set(c)))
    print(d)

    
    
main()

s=random.randint(65,90)
r=chr(s)
print(r)