day05.py

import hashlib
import itertools


seed = b'uqwqemis'

chars = []
remaining_positions = set('01234567')
positions = [None] * 8

for i in itertools.count():
    m = hashlib.md5()
    m.update(seed)
    m.update(str(i).encode())
    digest = m.hexdigest()
    if digest.startswith('00000'):
        if len(chars) < 8:
            chars.append(digest[5])
        if digest[5] in remaining_positions:
            positions[int(digest[5])] = digest[6]
            remaining_positions.remove(digest[5])
            if not remaining_positions:
                break

print('part 1:', ''.join(chars))
print('part 2:', ''.join(positions))