test.py

food = ["和食","洋食","中華"]
depth = 0
hots = []

while True:
    if depth == 0:
        print(food)
        print("どれを食べますか (0/1/2)")
        choice = input(">")
        for n in range(len(food)):
            hots.append(str(n))
        if choice in hots:
            depth += 1
            continue
        else:print("入力エラー")
    if depth == 1:
        print(food[int(choice)],"で本当にいいですか (Y/N)")
        yesno = input(">")
        if yesno in ["y","Y"]:
            depth += 1
            continue
        elif yesno in ["n","N"]:
            depth = 0
            continue
        else:print("入力エラー")
    if depth == 2:
        print(food[int(choice)]+"を注文します...")
        break
print("完了")