python inet_ntoa and inet_aton

py2

def inet_ntoa(n):
    import socket, struct
    if n:
        try:
            packed_value = struct.pack('!I', int(n))
            ip = socket.inet_ntoa(packed_value)
            return ip
        except:
            return None
    return None

def inet_aton(ip):
    import socket, struct
    n = socket.inet_pton(socket.AF_INET, ip)
    n = struct.unpack('!I', n)[0]
    return n

py3

def inet_ntoa(n):
    import ipaddress
    return str(ipaddress.ip_address(n))


def inet_aton(ip):
    import ipaddress
    return int(ipaddress.ip_address(ip))

https://www.cnblogs.com/gala/archive/2011/09/22/2184801.html