python3----练习题(....)

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

 1 # 获取网页源码
 2 
 3 def get_html_text(url):
 4     try:
 5         r = requests.get(url, timeout=30)
 6         r.raise_for_status()   # 如果状态不是200,引发HTTPError 异常
 7         r.encoding = r.apparent_encoding
 8         return r.text
 9     except:
10         return "产生异常"

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