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webpage.txt 文件保存了某网站的网页 HTML 源代码\n\n请修改编辑器中的代码，统计 webpage.txt 文件中以 .JPG 结尾的图像文件 URL 的数量。\n将统计结果打印输出。\n\n示例输出：\n输出：15","description","考点：逐行扫描 HTML 源码；连续两次 split 抠出 src 里的地址；计数。\n\n分段解析：\n1. 读入所有行：`f = open(\"webpage.txt\",\"r\")` 后 `ls=f.readlines()`，随即 close。\n2. 逐行判断 `if \"img\" in line`，命中后 `url=line.split(\"src=\")[-1].split('\"')[1]` 抠出地址：先按 src= 切取最后一段，再按双引号切取下标 1。\n3. 再检查 URL 是完整链接且以 `.JPG` 结尾，符合时计数器加一。\n4. 最后打印个数。\n\n易错：\n- 两次 split 的下标别弄反：第二次切完，[0] 是引号前的残余，[1] 才是地址本身。\n- 计数器 num 要在循环之前初始化。\n- 当前代码同时检查http和url.endswith(\".JPG\")，因此不会将.png等其他后缀计入。","initial_code","# 请在此文件作答","reference_answer","# 以下代码仅供参考\n#读取文件内容到列表ls中\nf = open(\"webpage.txt\",\"r\")\nls=f.readlines()\nf.close()\n#统计url个数\nnum= 0 #统计个数的初始值为0\nfor line in ls:\n if \"img\" in line:\n url=line.split(\"src=\")[-1].split('\"')[1] #用\"src=\"分割，再用“\"”分割，其中序号为1的元素就是url本身\n if \"http\" in url and url.endswith(\".JPG\"): #仅计完整 JPG 图片链接\n num = num+1 #统计个数\nprint(num) 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\n环境保护\n