ip, digital transfer
# ip ==> 数字 >>> ip2num = lambda x:sum([256**j*int(i) for j,i in enumerate(x.split('.')[::-1])]) >>> ip2num('192.168.0.1')
3232235521
# 数字 ==> ip # 数字范围[0, 255^4] >>> num2ip = lambda x: '.'.join([str(x/(256**i)%256) for i in range(3,-1,-1)]) >>> num2ip(3232235521)
'192.168.0.1'
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