import requests

if __name__ == '__main__':
    mb = 1024*1024
    try:
        resp = requests.get(url, headers=headers, timeout=5, stream=True)
        size = 0
        print("开始下载")
        with open("test.mp4", "wb") as f:
            for chunk in resp.iter_content(chunk_size=1024):
                f.write(chunk)
                size += len(chunk)
                print(f'已下载:{round(size/mb,2)}MB')
            f.close()
    except Exception as e:
        print(e)