python3----练习题(....)

 # 保存文件(文本,图片,视频...)
 1 def save_file():
     url = 'http://css.8684.cn/citys/images/line/45.jpg'
     root = r'd:/pics/'
     path = root + url.split('/')[-1]
     try:
         if not os.path.exists(root):
             os.mkdir(root)
         if not os.path.exists(path):
             r = requests.get(url)
             with open(path, 'wb') as f:
                 f.write(r.content)
                 f.close()
                 print("文件保存成功")
         else:
             print("文件已存在")
     except:
         print("爬取失败")

 # 获取网页源码

 def get_html_text(url):
     try:
         r = requests.get(url, timeout=30)
         r.raise_for_status()   # 如果状态不是200,引发HTTPError 异常
         r.encoding = r.apparent_encoding
         return r.text
     except:
         return "产生异常"

# 获取IP
 1 def get_ip():
     url = 'http://www.ip138.com/ips1388.asp?ip='
     ip = '110.242.200.45'
     try:
         r = requests.get(url + ip)
         r.raise_for_status()
         r.encoding = r.apparent_encoding
         print(re.findall('<td align="center">(.*?)<br/><br/></td>', r.text))
     except:
         print("爬取失败")