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")