Python中异常处理的最佳实践示例-向日葵屋

Python中异常处理的最佳实践示例

原创桃扇骨 2025-02-23 12:06 6阅读 0赞

在Python编程中，异常处理是处理程序运行时出现错误的常见方式。以下是一些最佳实践示例：

使用try/except块：

try:
    # 这里是可能会出错的代码
    x = 1 / 0  # 这会引发一个ZeroDivisionError
except ZeroDivisionError:  # 捕获特定错误
    print("You can't divide by zero!")

使用finally块：

def download_file(url):
    try:
        response = requests.get(url)
        if response.status_code == 200:
            with open('file_name.pdf', 'wb') as file:
                file.write(response.content)
            return "File downloaded successfully!"
        else:
            print("Failed to download file. Status code: ", response.status_code)
            return "Download failed."
    except Exception as e:
        print("An error occurred while downloading the file:", str(e))
        finally:
            if 'file' in locals():
                try:
                    file.close()
                except Exception as f:
                    print("Error closing file:", str(f)))
    return None
download_file('http://example.com/file.pdf')