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：