python爬取趣事百科文本笑话，另中间两个for能同时输出不解，请看到的朋友帮忙解答

#coding=utf-8
import requests
from lxml import etree
from bs4 import BeautifulSoup
print('#'*30)
info='''    *** 趣事百科 ***
    爬取文本笑话
    使用模块requests,lxml的etree
    爬出下一页地址返回循环判断'''
print(info)
print('#'*30)

class Qsbk(object):
    def __init__(self):
        self.homeurl='https://www.qiushibaike.com'
        self.xpathname='./div[1]/a[1]/img/@alt'
        self.xpathtext='./a[1]//span/text()'
        self.xpathname_text = '//div[@class="col1"]/div'
        self.xpathpage = '//*[@id="content-left"]/ul/li[last()]/a/@href'

    def def_name(self,url):
        response=requests.get(url)
        html=response.text
        tree=etree.HTML(html)
        name_texts=tree.xpath(self.xpathname_text)

        #每页用户ID和内容       
        for name_text in name_texts:
            #print(name_text)
            names=name_text.xpath(self.xpathname)
            texts=name_text.xpath(self.xpathtext)

            #下面两个for能同时输出，不理解,请看到朋友帮忙解答
            for name in names:
                print('\n昵称：',name)
            for text in texts:
                print('内容：',text.replace('\n','').replace('\r',''))

        #下一页地址返回给方法
        nextpage=tree.xpath(self.xpathpage)[0]
        nextpage=self.homeurl+nextpage
        #print(nextpage)
        return nextpage

#主程序
if __name__=='__main__':
    aa = Qsbk()
    url='https://www.qiushibaike.com'

    #用下一页表判断是否爬过跳出循环
    pagelist=[]
    while 1:

        if not url in pagelist:
            nexturl=aa.def_name(url)
            pagelist.append(url)
            url = nexturl
            print('下一页地址：'+nexturl)
        else:
            print('完成，爬取了下列页笑话')
            print(pagelist)
            break

while 1:
    pass