get yer cool extensions while they're hot!

extensions.py

import sys
import requests

URL = 'https://eventphone.de/guru2/phonebook?event=34C3&s=&page=1&format=json'

patterns = {
    'doubled': lambda x: x[0] == x[1] and x[2] == x[3],
    'alternate': lambda x: x[0] == x[2] and x[1] == x[3],
    'end ten': lambda x: x[0] == x[1] and x[3] == '0',
    'middle same': lambda x: x[1] == x[2],
    'three': lambda x: x[0] == x[1] == x[2] or x[1] == x[2] == x[3],
    'two': lambda x: x[0] == x[1] or x[1] == x[2] or x[2] == x[3],
    'ascending': lambda x: sorted(x) == x,
    'descending': lambda x: reversed(sorted(x)) == x,
    'boring as shit': lambda x: True
}

def parse(lines):
    for line in lines:
        if not set(line) < set('1 2 3 4 5 6 7 8 9 0'.split()):
            # spurious
            continue
        try:
            yield int(line)
        except ValueError:
            continue


def pals(xs):
    for name, check in patterns.items():
        print('\n' + name)
        for x in xs:
            if check(str(x)):
                yield x

data = requests.get(URL).json()
numbers = set(parse(x['extension'] for x in data))

AVAILABLE = set(range(2100, 8999)) - numbers

for p in pals(AVAILABLE):
    print(p)