dennis | PO files to ease development

First you could to exclude movies you alread have in the client list and then filter by genres combination

It works:

Not Depth First, but Breadth-First Search (BFS) is perhaps the most effective method to determine "inner circle" of some person.

If you want to reveal at most six levels of separation for two known persons, you also can try bi-directional BFS

Question about "who has relation" to Ken Thompson is quite philosophical... You need to define conditions yourself - perhaps you can reveal pupils in the same school, students and instructors in the same university, relatives, colleagues, all the UNIX users and C programmists ;), ... perhaps no.

The main issue is that in DB you return a. If you look at the condition of the loop just above that return, you'll see that this loop exits when a consists only of zeroes. So it is no wonder you only get zeroes in the output.

In the C-code you referred to, DB does not return anything. It prints. So if you want to make this a function that returns the result, you should collect the output in a variable at the same spot as where the C-code prints. This could be a JavaScript string, and then the function should return that string:

Below part is problematic in some ways:

Try and set the encoding to UTF-8

For example:

file = open(filename, encoding="utf8")

For reference check this post:

UnicodeDecodeError: 'charmap' codec can't decode byte X in position Y: character maps to

This method you can sort a list by several attributes

Sorting by two keys uses two methods of comparison to sort elements in a collection

.writerow() takes an iterable as an argument and writes all the parts as separate values to the csv.

You're giving it a string (f'{n}{l}') and that's an iterable of characters, which explains the output you get.

You should do this instead:

The output you show can be produced quite easily by:

XSLT 1.0

you can check if the array key exist using array_key_exists function to prevent the error