python 3.X dict 逆引きで一つのvalueから複数のkeyを抽出する

Question

#やりたいこと
以下の要素群からそれぞれの要素が何回登場するかを計上した後{名前:回数}とし、valueの値をinput関数によって入力させその対応した名前を列挙するプログラムの作成。

R1 = ("Foorin", "aiko", "Hinatazaka46", "Shimazu Aya", "Tendo Yoshimi",
      "AKB48", "LiSA", "Sakamoto Fuyumi", "Oka Midori", "TWICE",
      "Little Glee Monster", "Keyakizaka46", "Mizumori Kaori", "Shina Ringo", "Nogizaka46",
      "Perfume", "Ishikawa Sayuri", "Superfly", "Ikimonogakari", "Matsuda Seiko", "MISIA",
      "Go Hiromi", "GENERATIONS", "Junretsu", "Hey!Say!JUMP", "Kis-My-Ft2"
      "Yamauchi Keisuke", "Miura Daichi", "King Gnu", "Fukuyama Masaharu", "Itsuki Hiroshi",
      "DA PUMP", "Official Hige Dandism", "King&Prince", "Miyama Hiroshi", "Kanjani8",
      "Hoshino Gen", "RADWIMPS", "Suda Masaki", "Yuzu", "Hikawa Kiyoshi", "Arashi")
         
H30 = ("Sakamoto Fuyumi", "Little Glee Monster", "DAOKO", "Oka Midori", "Tendo Yoshimi",
       "Aimyon", "Mizumori Kaori", "Shimazu Aya", "Ikimonogakari"
       "AKB48", "Perfume", "Keyakizaka46", "Nishino Kana", "TWICE",
       "Superfly", "aiko", "Matsuda Seiko", "Matsutoya Yumi", "MISIA", "Ishikawa Sayuri",
       "Sandaime J Soul Brothers", "Go Hiromi", "Yamauchi Keisuke", "Hey!Say!JUMP", "Suchmos",
       "Junretsu", "Sexy Zone", "YOSHIKI", "Itsuki Hiroshi", "DA PUMP",
       "Fukuyama Masaharu", "King&Prince", "Kanjani8", "Miyama Hiroshi", "SEKAI NO OWARI",
       "EXILE", "Miura Daichi", "Hikawa Kiyoshi", "Hoshino Gen", "Yonezu Kenshi",
       "Yuzu", "Arashi")

H29 = ("Little Glee Monster", "E-girls", "SHISHAMO", "AI", "Oka Midori",
       "Ichikawa Yukino", "Tendo Yoshimi", "Kuraki Mai", "TWICE", "Mizumori Kaori",
       "Shimazu Aya", "Keyakizaka46", "Sakamoto Fuyumi", "Nishino Kana", "Nogizaka46",
       "Matsuda Seiko", "Shina Ringo", "Perfume", "AKB48", "Matsu Takako",
       "Superfly", "Takahashi Mariko", "Ishikawa Sayuri",
       "Hey!Say!JUMP", "Yamauchi Keisuke", "Miyama Hiroshi", "Takehara Pistol", "Sexy Zone",
       "Fukuda Kouhei", "Sandaime J Soul Brothers", "SEKAI NO OWARI", "Miura Daichi", "WANIMA",
       "Go Hiromi", "Kanjani8", "Fukuyama Masaharu", "TOKIO", "Itsuki Hiroshi",
       "Hirai Ken", "Totasu Matsumoto", "X JAPAN", "Elephant kashimashi", "Hoshino Gen",
       "Arashi", "Hikawa Kiyoshi", "Yuzu")

H28 = ("PUFFY", "E-girls", "Keyakizaka46", "miwa", "Tendo Yoshimi",
       "Ichikawa Yukino", "Kouzai Kaori", "Shina Ringo", "Ayaka", "Mizumori Kaori",
       "Ikimonogakari", "Nogizaka46", "Shimazu Aya", "Nishino Kana", "AI",
       "AKB48", "Perfume", "Otake Shinobu", "Sakamoto Fuyumi", "Matsuda Seiko",
       "Takahashi Mariko", "Utada Hikaru", "Ishikawa Sayuri", 
       "Kanjani8", "AAA", "Miyama Hiroshi", "Yamauchi Keisuke", "Sexy Zone",
       "SEKAI NO OWARI", "Sandaime J Soul Brothers", "Fukuda Kouhei", "Go Hiromi", "V6",
       "Yuzu", "RADWIMPS", "Fukuyama Masaharu", "RADIO FISH", "Kiritani Kenta",
       "Itsuki Hiroshi", "KinKi Kids", "Hoshino Gen", "TOKIO", "X JAPAN",
       "THE YELLOW MONKEY", "Hikawa Kiyoshi", "Arashi")

H27 = ("Ohara Sakurako", "Godai Natsuko", "Nogizaka46", "E-girls", "Sakamoto Fuyumi",
       "Myuzu", "AAA", "Shimazu Aya", "Fuji Ayako", "miwa",
       "Wada Akiko", "Tendo Yoshimi", "NMB48", "Mizumori Kaori", "Ikimonogakari",
       "Shina Ringo", "AKB48", "Superfly", "Nishino Kana", "Ishikawa Sayuri",
       "Perfume", "MISIA", "Rebecca", "Imai Miki", "Takahashi Mariko", "Matsuda Seiko", 
       "Go Hiromi", "Sexy Zone", "Miyama Hiroshi", "SEKAI NO OWARI", "Tokunaga Hideaki",
       "Yamauchi Keisuke", "Hoshino Gen", "Gesunokiwamiotome", "Yuzu", "Hikawa Kiyoshi",
       "Hosono Takashi", "Kanjani8", "Sandaime J Soul Brothers", "Fukuyama Masaharu", "TOKIO",
       "Arashi", "EXILE", "Golden Bomber", "BUMP OF CHICKEN", "Itsuki Hiroshi", "V6", "X JAPAN",
       "Miwa Akihiro", "SMAP", "Mori Shinichi", "Kondo Masahiko")

##{名前:回数}の作成

new_list = []
all_singer = list(H27) + list(H28) + list(H29) + list(H30) + list(R1)
new_list.append(all_singer)

counter = {}
for i in all_singer:
       if i in counter:
              counter[i] += 1
       else:
              counter[i] = 1

for s,v in sorted(counter.items()):
       print(s,v)

上のプログラム利用して上記の{名前:回数}のdictを作成したのですがここから同一の回数を持つ名前を列挙する点で苦戦しています。
while True を利用し以下のように途中まで作成してみましたが上手に動かず八方塞がりとなってしまいました。
有識者の皆様よろしければご教授いただけると幸いです。

Comments

[LouiS0616]

直前の質問と何が違うのでしょうか？
https://teratail.com/questions/269665

Answer 1

keys = [k for k, v in counter.items() if v == 3]
print(keys)

のようにできます。このコードでは、回数が3の時の名前のリスト keys を作成して、それをprintしています。

参考URL: Pythonで辞書の値からキーを抽出

Comments

[6Hawaiian]

回答ありがとうございます。
解答を参考に
key1 = [k for k, v in counter.items() if v == 1]
key2 = [k for k, v in counter.items() if v == 2]
key3 = [k for k, v in counter.items() if v == 3]
key4 = [k for k, v in counter.items() if v == 4]
key5 = [k for k, v in counter.items() if v == 5]

while True:
number1_5 = input("出場回数を指定してください　＞　")
if number1_5 == 1:
print(key1)
elif number1_5 == 2:
print(key2)
elif number == 3:
print(key3)
elif number ==4:
print(key4)
elif number == 5:
print(key5)
というプログラムを作成したのですが、うまく動かず悩んでいます
よろしければ改善点をご指導ください。

[kabayan55]

手元で動かしてみましたが、
NameError: name 'number' is not defined
と出ますね！

elifの3〜5の箇所が number になっていますが、number1_5 にすれば良さそうです。
また、print(type(number1_5)) のように型を見ていただけるとわかると思うのですが、number1_5はstr型になっていたので、int型にする必要がありそうです。

同じことをするコードを以下のように簡潔に書くこともできます。
while True:
number1_5 = input("出場回数を指定してください　＞　")
key = [k for k, v in counter.items() if v == int(number1_5)]
print(key)