Hit and blow game #2

Hit and Blowは有名な数字当てゲームです。
出題者は0から9までの数字を重複しないように決められた桁数選びます。
解答者は何度でも回答できます。外れた場合は、

Hit(当たっている数)
Blow(数字は当たっているが桁が違う)
それぞれの数を教えてもらえます。
例.
正解 = "146"
回答(1) = "241" 1 Hit, 1 Blow
これをヒントに正解を目指すというゲームです。

import random
def hitblow(command, ans):
    hit = 0
    blow = 0
    for i in range(len(command)):
        if command[i] == ans[i]:
            hit += 1
        else:
            if command[i] in ans:
                blow += 1
    return [hit, blow]

def generatoroff(length):　# not used
    ans = []
    while len(ans) < length:
        rand = random.randint(0, 9)
        if rand in ans:
            pass
        else:
            ans += [rand]
    return ans
    
def generator(length): # Another solution
    dummy=[0,1,2,3,4,5,6,7,8,9]
    random.shuffle(dummy)
    ans=[]
    i=0
    while i < length:
        ans += [dummy[i]]
        i +=1
    return ans
    
print("Hit & Blow Game")
digit = input("Please, enter the number of digits you want to play: ")
ans = generator(int(digit))
cont = True
count = 0
print("Game Start!")
while cont:
    count += 1
    command = input("enter the {} digits number > ".format(digit))
    your_ans = [int(command[i]) for i in range(len(command))]
    [hit, blow] = hitblow(your_ans, ans)
    print("{}: {} Hit, {} Blow".format(command, hit, blow))
    if hit == len(ans):
        print("Congratulations!!! You took {} steps.".format(count))
        cont = False



=== RESTART: C:/python/Hit AndBlow02.py ===============
Hit & Blow Game
Please, enter the number of digits you want to play: 2
Game Start!
enter the 2 digits number > 01
01: 0 Hit, 0 Blow
enter the 2 digits number > 23
23: 1 Hit, 0 Blow
enter the 2 digits number > 24
24: 1 Hit, 0 Blow
enter the 2 digits number > 25
25: 2 Hit, 0 Blow
Congratulations!!! You took 4 steps.
>>>