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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def address_to_ip(address):
 """Convert a hostname to a numerical IP addresses in an address. This should be a no-op if address already contains an actual numerical IP address. Args: address: This can be either a string containing a hostname (or an IP address) and a port or it can be just an IP address. Returns: The same address but with the hostname replaced by a numerical IP address. """

    address_parts = address.split(":")
    ip_address = socket.gethostbyname(address_parts[0])
    # Make sure localhost isn't resolved to the loopback ip
    if ip_address == "127.0.0.1":
        ip_address = get_node_ip_address()
    return ":".join([ip_address] + address_parts[1:])