python, 综合案例，应用tkinter, request建立天气预报查小程序

import tkinter as tk
from tkinter import messagebox
import urllib.request
import requests
import re
import sys

def inquire():
    cityName = entry.get() # 获取输入框信息
    if cityName == \'\':
        messagebox.showinfo(\'提示\', \'请输入您要查询的城市！\')
    else:
        city = urllib.request.quote(cityName) # urllib.request.quote()将汉字编码
        raw_url = \'https://www.tianqi.com/?keyword=\' + city
        header = {\'user-agent\':\'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.16 Safari/537.36\'}
        resp = requests.get(raw_url, headers = header)

        reg = re.compile(\'<li><a href="(.*?)" title="%s天气预报">%s天气预报</a></li>\' % (cityName, cityName))
        try:
            url = re.findall(reg, resp.text)[0]  # 获得要查询城市天气预报的网址url
            resp = requests.get(url, headers = header)
        except:
            messagebox.showinfo(\'警告\', \'您输入的城市查不到！\')
            sys.exit()
        reg = re.compile(\'<dd class="week">(.*?)</dd>\')
        cur_date = re.findall(reg,resp.text)[0] # 提取当前日期
        reg = re.compile(\'<p class="now"><b>(.*?)</b><i>℃</i></p>\')
        cur_temperature = re.findall(reg, resp.text)[0] # 提取当前温度
        reg = re.compile(\'<span><b>(.*?)</b>(.*?)</span>\')
        cur_weather, cur_trange = re.findall(reg, resp.text)[0][0],re.findall(reg, resp.text)[0][1] #提取当前天气，温度范围
        # 在listbox列表框中显示天气
        lis.delete(0, tk.END) # 首先清空列表框
        lis.insert(0, \'城市：%s\' % cityName)
        lis.insert(1, \'日期：%s\' % cur_date)
        lis.insert(2, \'当前温度：%s\' % cur_temperature)
        lis.insert(3, \'天气：%s\' % cur_weather)
        lis.insert(4, \'温度范围：%s\' % cur_trange)


root = tk.Tk()
root.title(\'城市天气查询软件\')
root.geometry(\'400x300+20+20\')
label = tk.Label(root, text = \'请输入城市名称：\',font = (\'仿宋\', 15))
label.grid(row = 0, column = 0, sticky = tk.W)
entry = tk.Entry(root, font = (\'仿宋\', 15),width = 22)
entry.grid(row = 0, column = 1, sticky = tk.E)
lis = tk.Listbox(root, font = (\'仿宋\', 15),width = 40, height = 11)
lis.grid(row = 1, columnspan = 2, sticky = tk.W)
btn1 = tk.Button(root, text = \'查询\', font = (\'仿宋\', 15), command = inquire)
btn1.grid(row = 2, column = 0, sticky = tk.W)
btn2 = tk.Button(root, text = \'退出\', font = (\'仿宋\', 15), command = root.quit)
btn2.grid(row = 2, column = 1, sticky = tk.E)
root.mainloop()

　运行后效果：