python爬取当前天气的代码

以下是一个示例Python程序，可以使用它从中国天气网中爬取当前的天气情况：

import requests

def get_weather(city):
    url = 'http://www.weather.com.cn/weather/{}.shtml'.format(city)
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'}
    r = requests.get(url, headers=headers)
    r.encoding = 'utf-8'
    weather_dict = {}
    
    try:
        # 解析城市和时间信息
        city = r.json()['weatherinfo']['city']
        time = r.json()['weatherinfo']['time']
        weather_dict['城市'] = city
        weather_dict['时间'] = time
        # 解析天气信息
        weather = r.json()['weatherinfo']['weather']
        temp = r.json()['weatherinfo']['temp']
        wind = r.json()['weatherinfo']['WD'] + ' ' + r.json()['weatherinfo']['WS']
        weather_dict['天气'] = weather
        weather_dict['温度'] = temp
        weather_dict['风力'] = wind
        return weather_dict
    except:
        return None

if __name__ == '__main__':
    city = '北京'  # 城市名称
    weather_dict = get_weather(city)
    if weather_dict:
        for key, value in weather_dict.items():
            print(key + ':', value)

在运行此代码之前，请确保您已安装了`requests`库。

此程序将检索指定城市的当前天气情况，并打印其城市，时间，天气，温度和风力信息。它使用HTTP请求获取有关天气的JSON响应，然后解析它以获得所需的信息。