Mostly for personal curiosity reasons:

Many modern languages provides something called interator (sic?), ... it will be really cool, if you can write this in Python.

Since this isn't Python, but Perl, where

my $file = './test_file';

#my $line = inFile->new($file);
open (my $FILE, '<', $file) 
   || die "failed to open $fname ($!)\n";

while (<$FILE>) {
#print $line->getLine();
    print;
}
close $FILE || die "failed to open $fname ($!)\n";
[download]

Should suffice.

This may not be substantial for a short exercise, but if this is a base for a bigger application, it could cause it to bloat. Any reason why you picked this way to "Do It"?