### Python实用生活小工具示例 #### 天气查询脚本 编写一个简单的天气查询程序可以帮助用户快速获取指定城市的当前天气状况。此程序利用第三方API来获得实时数据。 ```python import requests def get_weather(city_name, api_key): base_url = "http://api.openweathermap.org/data/2.5/weather?" complete_url = base_url + "appid=" + api_key + "&q=" + city_name response = requests.get(complete_url) data = response.json() if data["cod"] != "404": main = data['main'] temperature = main['temp'] - 273.15 # Convert Kelvin to Celsius weather_description = data['weather'][0]['description'] result = f"Weather in {city_name}: Temperature is {temperature:.2f}°C and the condition is {weather_description}" return result else: return "City not found" ``` 该函数通过给定的城市名称和OpenWeatherMap API密钥返回相应的天气信息[^1]。 #### 计算BMI指数的小应用 另一个有用的生活类Python小程序是可以帮助人们计算他们的身体质量指数(BMI)，这有助于个人健康管理。 ```python def calculate_bmi(weight_kg, height_m): bmi_value = weight_kg / (height_m ** 2) interpretation = "" if bmi_value < 18.5: interpretation = "Underweight" elif 18.5 <= bmi_value < 24.9: interpretation = "Normal Weight" elif 25 <= bmi_value < 29.9: interpretation = "Overweight" else: interpretation = "Obesity" output_message = f"Your BMI value is {bmi_value:.2f}, which means you are considered as '{interpretation}'." return output_message ``` 这段代码接收用户的体重(kg)与身高(m), 并输出对应的BMI值及其解释[^2]。