@cvp You are right . Function name can't be written casually.

I almost finished my code.
But still have a problem
When I tapped button0 TAP ,button0 does not disappear as sender.title = ‘ ‘, and the new button has displayed.
And how to use remove_subview(button0)?

import requests
import re
import json
import ui, appex
import webbrowser

headers={
    'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
}
data = {
    'cate':'realtimehot'
}


def get_page(url):
    response = requests.get(url)
    html = response.text
    #print(html)
    return html


def parse_html(html):
    #top = re.findall(r'class="icon-top"></i></td>.*?<td class="td-02">.*?<a href="(.*?)" target="_blank">(.*?)</a>.*?</td>', html, re.S)
    data = re.findall(r'ranktop">(.*?)</td>.*?<a href="(.*?)" target="_blank">(.*?)</a>.*?<span>(.*?)</span>', html, re.S)
    #print(top)
    #print(data)
    return data


def write_data(data):
    with open(r'./wb.json', 'w', encoding='gbk') as f:
        for i in data:
            f.writelines(json.dumps(i) + '\n')
    print('done')
    

def get_json(items, host):
    for item in items:
        yield {
            'rank': item[0],
            'href': host + item[1],
            'title': item[2],
            'num': item[3],
        }

class control(ui.View):
    def __init__(self):
        self.frame=(0,0,400,600)
        appex.set_widget_view(self)
        
        
    def button_tapped1(self, sender):
        webbrowser.open(sender.href)

        
    def button_tapped(self, sender):
        sender.title = ''
        self.list()
    

    def layout(self):
        button0 = ui.Button(font=('<System>', 34), frame=(100,25,200,40), tint_color='red')
        button0.title = 'TAP'
        button0.action = self.button_tapped
        self.add_subview(button0)
        return button0
    

    def list(self):
        host = 'https://s.weibo.com'
        url = 'http://s.weibo.com/top/summary?'
        html = get_page(url)
        data = parse_html(html)
        wb = get_json(data, host)
        write_data(wb)
        with open('./wb.json', 'r') as f:
            wb = f.readlines()
        for i in range(0,23):
            wbi = wb[i]
            title = json.loads(wbi)['title']
            href = json.loads(wbi)['href']
            #title = json.loads(wbi)
            button = ui.Button(title=title, font=('<System>', 18))
            button.href = 'Alook://' + href
            button.action = self.button_tapped1
            button.frame = (0,i*25,400,20)
            self.add_subview(button)

    
def main():
    control()


if __name__ == '__main__':
    main()

I’ll try.
Thank you @ccc and thank @cvp .
Also thanks to Google Translate.😅

@ccc my button url is a variable.

def button_tapped(sender):
    self.webbrowser.open(href) #？？？
v=ui.View(frame=(0,0,300,400))
with open('./wb.json', 'r') as f:
    wb = f.readlines()
    for i in range(0,20):
        wbi = wb[i]
        title = json.loads(wbi)['title']
        href = json.loads(wbi)['href']  #href is the button url
        button = ui.Button(title=title)
        button.action = button_tapped 
        button.frame = (0,i*25,450,20)
        v.add_subview(button)

I think I need 20 button.tapped functions.

@ccc there’s many links in a file, Function cannot pass variables.

And another problem is Button.action
The function must take a single sender parameter.
I want different buttons to correspond to different links.

@mikael I plan to do less than 50 lines.
Each button is actually a hyperlink that allows browse the web in the widget.That's my idea.

@brumm I succeeded
I didn't set the position when I tried it, the second button blocked the first button.
Thank U.

@cvp Thank u.
Can you give me an example with the following code?
In a widget display both button1 and button2.

v = ui.View()
button1 = ui.Button(title='button1')
button2 = ui.Button(title='button2')
v.add_subview(button)
appex.set_widget_view(v)

It use in widget.
1.get date in a json file
2.get date from datetime
3.If the two dates are the same, read the json file，else update the json file and read it.
4.put the result in widget.

I am a newbie, please advise.

And I want to ask how to display multiple buttons in the widget and can turn pages？

# -*- coding: UTF-8 -*-

import requests
import re
import json
import datetime
import appex, ui

headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36',
'Accept-Language': 'zh-CN,zh;q=0.9'
}


def get_page(url):
    response = requests.get(url, headers=headers)
    data = json.loads(response.text)
    return data


def write_file(data):
    with open(r'./mryj.json', 'w+') as f:
        f.write(json.dumps(data))
        print('文件已更新')


def get_filedate():
    try:
        with open(r'./mryj.json', 'r') as f:
            d = json.loads(f.read())
            filedate = d['dateline']
            print('文件日期 ', filedate)
    except:
        with open(r'./mryj.json', 'w+') as f:
            d = f.write(json.dumps({'dateline':'None'}))
            filedate = 'None'
    return filedate


def get_datetime():
    timenow = datetime.datetime.now().strftime('%Y-%m-%d')
    print('实际日期 ', timenow)
    return timenow



def layout():
    with open(r'./mryj.json', 'r') as f:
        data = json.loads(f.read())
    v = ui.View()
    text = ui.TextView(font=('Didot', 15))
    text.text = '   ' + data['note'] + '\n' + '  ' + data['content']
    text.editable = False
    text.selectable = False
    v.add_subview(text)
    appex.set_widget_view(text)
    
url = 'http://open.iciba.com/dsapi/'

filedate = get_filedate()
timenow = get_datetime()
if filedate == timenow:
    print('时间相同,读取文件')
    layout()
else:
    print('时间不同，更新文件')
    data = get_page(url)
    write_file(data)
    layout()