H_na_rorotoroガチャ

rorotoro.py

import random
import itertools

def rorotoro():
    for ro in range(1, 5):
        to = 4 - ro
        for rorotoro in itertools.permutations((['ro'] * ro) + (['to'] * to)):
            yield ''.join(rorotoro)

def h_na_rorotoro(num_min_underscores=1, num_max_underscores=30):
    for i in range(num_min_underscores, num_max_underscores):
        underscore1 = '_' * i
        for j in range(num_min_underscores, num_max_underscores):
            underscore2 = '_' * j
            for rrtr in rorotoro():
                yield "H{}na{}{}".format(underscore1, underscore2, rrtr)

print(random.choice(list(h_na_rorotoro())))