gistfile1.py

import csv
import yapgvb

graph = yapgvb.Digraph('OriginalZombie')
rows = list(csv.DictReader(open('players.csv')))


def get_victims(id):
    for row in rows:
        if id == row['killed_by']:
            yield row
def gen(killer=None, parent=None):
    if killer is None:
        killer = {'id':'OriginalZombie'}
    if parent is None:
        parent = graph.add_node('OZ',label='OriginalZombie')
    for vic in get_victims(killer['id']):
        node = graph.add_node(vic['id'], label=vic['fname'], shape='record')
        parent >> node
        gen(vic, node)

gen()
graph.layout(yapgvb.engines.dot) 
graph.render('players.png')