由域名获取该域名的ip地址，获取域名ip地址,主要还是查询http:/

由域名获取该域名的ip地址，获取域名ip地址,主要还是查询http:/

主要还是查询http://ip.chinaz.com/，从中获得结果

import urllibimport httplibimport reimport urlparseimport jsondef ip(host_addr,format="dot"):    '''    describe:        function try to find the ip addr of the given host addr    params:        host_addr:the format like www.baidu.com or http://www.baidu.com        format:the format of return value                dot=>ip string like 123.121.121.21,                num=>number format like 327382483    return :IP string list or number list when num specified    '''    query_url='http://ip.chinaz.com/?'    if host_addr.startswith("http"):        req_url=urlparse.urlsplit(host_addr).netloc    else:        req_url=host_addr    r=urllib.urlopen(query_url+"IP="+req_url)    ipRex=r':\\s+([\\d\\.]*)\\s'    try:        if r !=None:            context=r.read()            rst=re.findall(ipRex,context)                      if rst!=None:                if format=="num":                    rss=[]                    for rs in rst:                                            sum=0                        for  f in enumerate(rs.split('.')):                            sum+=int(f[1])<<((3-f[0])*8)                        rss.append(str(sum))                    del rst                    rst=rss                return rst        return None    except :        return None#该片段来自于http://byrx.net