tournaments.csv

gistfile1.txt

Player name,ELO
HijabiKathy,887
Ugo Flickerman,1099
Rinderteufel,1134
N3rdicus,1241
SilkyZ,1259
Lyrelda,1266
GFX47,1353
Paragod,1452
The Great Eye,1792
Chrysophylax,2005
chilio6,2012
Mahrgell,2034
Pieniek,2093
mumpsimus,2472
gtresd,2534
Bockwurst,2757

from pprint import pprint
import random
import csv

seed = 'Oblivion'
random.seed(seed)

with open('tournament.csv', 'r', newline='') as f:
    players = []
    for row in csv.reader(f):
        players.append(row[0])

pot_size = int((len(players) - 1) / 4)

pots = [players[i:i + pot_size] for i in range(1, len(players), pot_size)]
for pot in pots:
    random.shuffle(pots)

groups = zip(*pots)

for n, group in enumerate(groups):
    print(chr(n + 65))
    for player in group:
        print(player)

output:

A
SilkyZ
The Great Eye
Pieniek
HijabiKathy

B
Lyrelda
Chrysophylax
mumpsimus
Ugo Flickerman

C
GFX47
chilio6
gtresd
Rinderteufel

D
Paragod
Mahrgell
Bockwurst
N3rdicus