天气数据的爬行Python代码

在Python中，我们可以使用`requests`库来爬取公开的天气API数据。这里以OpenWeatherMap (OWM) API为例，它提供了一个简单的RESTful API。下面是一个基本的示例代码，假设你已经注册了OWM API并获取了API key：

import requests
import json

def get_weather_data(city_name, api_key):
    base_url = "http://api.openweathermap.org/data/2.5/weather"
    params = {
        "q": city_name,
        "appid": api_key,
        "units": "metric"  # 或者 "imperial" 根据需求选择单位
    }
    
    try:
        response = requests.get(base_url, params=params)
        response.raise_for_status()  # 检查是否成功，如果状态码不是200则抛出异常
        
        data = response.json()
        
        main_data = data['main']
        weather_data = data['weather'][0]
        
        temperature = main_data['temp']
        humidity = main_data['humidity']
        description = weather_data['description']
        
        return {
            'temperature': temperature,
            'humidity': humidity,
            'description': description
        }
    except requests.exceptions.RequestException as e:
        print(f"Error fetching weather data: {e}")
        return None

city = "北京"
api_key = "your_openweathermap_api_key"
weather_data = get_weather_data(city, api_key)

if weather_data is not None:
    print(f"Weather in {city}:")
    for key, value in weather_data.items():
        print(f"{key.capitalize()}: {value}")

注意替换`your_openweathermap_api_key`为你实际的API密钥。上述代码仅用于演示，实际使用时应考虑更完善的错误处理和API速率限制。