📃 下载网络资源（视频、图片等）

以下载 mp4 的代码作为示例：

print("开始下载")
url = 'https://pic.ibaotu.com/00/51/34/88a888piCbRB.mp4'
r = requests.get(url, stream=True)
with open('g:/test.mp4', "wb") as mp4:
    for chunk in r.iter_content(chunk_size=1024 * 1024):
        if chunk:
            mp4.write(chunk)
print("下载结束")