老师，我这个为啥每次写入的yaml文件，的k值都是1了，我加了一个循环了。老师请教一下

import random
import os
import yaml

class email:
    def email_mvp(self):
        reuset=random.randint(100000,999999)
        reuslt='@qq.com'
        v_email=str(reuset)+reuslt
       # print(v_email)
        k_email=self.fenlei()
       # print(k_email)
        resuslts={
            k_email:v_email
        }
        print(resuslts)
        return resuslts


    def fenlei(self):

        with open("email.yaml",'r') as f:
            data=f.read()
            reuslt=yaml.load(data,Loader=yaml.FullLoader)
            print(reuslt,'+++++')
            li=len(reuslt)
            print(type(li))
            for i in range(li):
                y=i+1
                print(y,'=======')
                return y
    def mingcheng(self):
        with open("email.yaml",'a',encoding='utf-8') as f:
            yaml.dump(self.email_mvp(),f)


if __name__=='__main__':
    Em=email()
    #for i in range(1):
    Em.mingcheng()

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