# data file
(
    # Quoting the dotted quads since => will not quote 
    # those correctly
    '10.0.0.128' =>
        {
           '10.0.0.129'=>3,
           '10.0.0.129'=>4,
           '10.0.0.130'=>3,
           '10.0.0.131'=>2,
           '10.0.0.132'=>1,
           '10.0.0.133'=>1,
           '10.0.0.134'=>2,
           '10.0.0.135'=>4,
           '10.0.0.136'=>1,
           '10.0.0.137'=>4,
           '10.0.0.138'=>3
        },
    '10.0.0.129' =>
        {
           '10.0.0.128'=>3,
           '10.0.0.130'=>1,
           '10.0.0.131'=>2,
           '10.0.0.132'=>1,
           '10.0.0.133'=>2,
           '10.0.0.134'=>1,
           '10.0.0.135'=>2,
           '10.0.0.136'=>3, # the > was missing on this line...
           '10.0.0.137'=>3,
           '10.0.0.138'=>4
        },
);

##</code><code>##

my $x=join "",<FILE>;
my %graph = eval $x;