質問編集履歴
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完成コード追記
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@@ -149,3 +149,91 @@
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よろしくお願いしますm(__)m
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# できましたー(≧∇≦)b
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[mkgrei](https://teratail.com/users/mkgrei)さまのアドバイスのおかげです<3
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`header = 'user_id'`だけで`user_id,comment`の両方がヘッダーに入る理由がわかりませんが、最終的に望む挙動になったので嬉しいです(*^^*)
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```
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def del_dup():
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on_en = pd.read_csv('OnlyEn.csv')
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sorted_onen = on_en.sort_values(['user_id', 'comment'],
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ascending=[1, 0])
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# print(sorted_onen)
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# print(len(on_en))
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df = pd.DataFrame(sorted_onen)
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print(df)
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ans = df.groupby('user_id')['comment'].apply(lambda x: ','.join(x))
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print(ans)
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ans.to_csv('final.csv', header = 'user_id')
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del_dup()
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```
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```
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# OnlyEn.csv
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user_id,comment
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1,Hi
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2,World
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3,Hello
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4,Python
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3,Sato
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4,class
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3,find
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2,alice
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```
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```
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# final.csv
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user_id,comment
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1,Hi
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2,"alice,World"
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3,"find,Sato,Hello"
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4,"class,Python"
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```
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