Perl is great, its just too tough for me. Python is more clear.
I need your help

1. to see in regards of "specification" if this was indeed possible.
2. just wanted 1-line of Perl code to see it working, and then write the same 1-line in Python.

Wouldn't something like the following work as intended WITHOUT custom function?

pin = int( htmlpage.encode("hex"), 16 ) % 10000
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Can you please explain the differences to what i have posted opposed to your coding:

foreach my $ltr(@ltrs){
        $hash = ( $hash + ord($ltr)) %10000;
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I want to understand this.