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webpage.txt 文件中提取所有 .JPG 结尾的图像文件 URL。\n将提取出的每个 URL 写入文件 images.txt，每行一个 URL。\n\n输出文件示例（images.txt 内容）：\nhttp://image.ngchina.com.cn/2018/0829/20180829012548753.JPG \nhttp://image.ngchina.com.cn/2018/0823/thumb_469_352_20180823121155508.JPG \n","description","考点：按行筛选含 img 的行；连续两次 split 从属性里抠出 URL；写文件时手动补换行。\n\n分段解析：\n1. 读入所有行后逐行判断 `if \"img\" in line`，只处理图片标签所在的行。\n2. 抠出地址：`url = line.split(\"src=\")[-1].split('\"')[1]`。第一次按 src= 切，取最后一段；第二次按双引号切，下标 1 正好是引号中间的内容。\n3. 再检查 URL 是完整地址且以 `.JPG` 结尾，只保留题目要求的 JPG 图像地址。\n4. 写文件时每条 URL 后面补一个 \"\\n\"。\n\n易错：\n- 第二次 split 的下标别弄错：`split('\"')` 之后 [0] 是引号之前的残余，[1] 才是 URL 本身。\n- 用 [-1] 取 src= 之后的部分，比写死 [1] 更稳——一行里若还有别的属性也不会取错。\n- 写入时必须手动加换行，否则所有 URL 会挤成一行。","initial_code","# 请在此文件作答","reference_answer","# 以下代码仅供参考\n\nf = open(\"webpage.txt\",\"r\")\nls = f.readlines()\nf.close()\njpgurl = [] #定义空列表\nfor line in ls:\n if \"img\" in line:\n url = line.split(\"src=\")[-1].split('\"')[1]\n if \"http\" in url and url.endswith(\".JPG\"):\n jpgurl.append(url) #将url追加到列表中\nf=open(\"images.txt\",\"w\")\nfor url in jpgurl:\n f.write(url+\"\\n\") #添加换行符\nf.close()","name","网页处理-2","type","platform","python","group_id","part_number","order_index","entrypoint","main.py","files",[369,370],"tags",[356],{"_371":352,"_373":364,"_375":377},{"_371":372,"_373":374,"_375":376},"content","\n\n\n $\"photo$ \n\n

\n环境保护\n