python语言程序设计——2.4判断重复元素

• 判断是否为重复元素，如果有元素为重复，则返回该元素以及True

def repeat_it(x):
    count_it={}
    for i in range(len(x)):
        count_it[x[i]]=count_it.get(x[i],0)+1
    it=list(count_it.items())
    it.sort(key=lambda k:k[1],reverse= True)
    for j in range(len(it)):
        w,c=it[j]
        if c>1:
            q=True
            print("{}:{}".format(w,q)