統計英文兒歌《twinkle twinkle little star》中，使用到的單詞及其出現次數。要求去除單詞大小寫的影響，不統計標點符號的個數，並按降序輸出。
twinkle, twinkle, little star,
how i wonder what you are!
up above the world so high,
like a diamond in the sky.
twinkle, twinkle, little star,
how i wonder what you are!
when the blazing sun is gone,
when he nothing shines upon,
then you show your little light,
twinkle, twinkle, all the night.
twinkle, twinkle, little star,
how i wonder what you are!
題幹說去除大小寫，不統計標點，所以第一部先把大寫轉小寫並且把標點符號轉換成空格；然後用split函式將字串切片，返回乙個字串列表；接著統計列表中各元素出現次數，整合到乙個字典裡；最後用sorted對字典的值進行排序。
message = "twinkle, twinkle, little star,how i wonder what you are!" \
"up above the world so high,like a diamond in the sky." \
"twinkle, twinkle, little star,how i wonder what you are!" \
"when the blazing sun is gone,when he nothing shines upon," \
"then you show your little light,twinkle, twinkle, all the night." \
"twinkle, twinkle, little star,how i wonder what you are!"
message = message.lower().replace(',', ' ').replace('.', ' ').replace('!', ' ')
list_message = message.split()
count = {}
for i in list_message:
if i not in count:
count[i] = 1
else:
count[i] += 1
print(sorted(count.items(), key=lambda item: item[1], reverse=true))
[('twinkle', 8), ('little', 4), ('you', 4), ('the', 4), ('star', 3), ('how', 3), ('i', 3), ('wonder', 3), ('what', 3), ('are', 3), ('when', 2), ('up', 1), ('above', 1), ('world', 1), ('so', 1), ('high', 1), ('like', 1), ('a', 1), ('diamond', 1), ('in', 1), ('sky', 1), ('blazing', 1), ('sun', 1), ('is', 1), ('gone', 1), ('he', 1), ('nothing', 1), ('shines', 1), ('upon', 1), ('then', 1), ('show', 1), ('your', 1), ('light', 1), ('all', 1), ('night', 1)]統計文章單詞出現次數
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