### 使用Python从API获取实时天气数据 在现代应用开发中，通过API获取实时数据是一项基本技能。对于天气预报这类常见应用场景，可以借助`requests`库与OpenWeatherMap API交互来实现这一目标[^1]。 #### 准备工作 首先需安装必要的依赖包： ```bash pip install requests ``` 接着设置环境变量保存API密钥以便安全调用API服务： ```python import os os.environ["OPENWEATHERMAP_API_KEY"] = "your_api_key_here" api_key = os.getenv('OPENWEATHERMAP_API_KEY') ``` #### 获取并处理天气信息 定义函数用于发起HTTP GET请求至指定的城市名称对应的URL地址，并解析JSON响应体中的关键字段如温度、湿度等气象参数： ```python import requests def get_weather(city_name): base_url = "http://api.openweathermap.org/data/2.5/weather?" complete_url = f"{base_url}q={city_name}&appid={api_key}" response = requests.get(complete_url) data = response.json() if data['cod'] != '404': main = data['main'] temperature = main['temp'] pressure = main['pressure'] humidity = main['humidity'] weather_description = data['weather'][0]['description'] result = { 'Temperature': temperature, 'Pressure': pressure, 'Humidity': humidity, 'Description': weather_description } return result else: return None ``` 最后测试该方法能否正常工作，传入城市名作为参数查看返回的结果集： ```python if __name__ == "__main__": city = "London,GB" weather_info = get_weather(city) if weather_info is not None: print(f"Weather in {city}:") print(f"Temperature: {weather_info['Temperature']}K") print(f"Pressure: {weather_info['Pressure']}hPa") print(f"Humidity: {weather_info['Humidity']}%") print(f"Description: {weather_info['Description'].capitalize()}") else: print("City Not Found!") ``` 上述代码片段实现了基于命令行界面查询特定地点当前气候状况的功能[^2]。