回答編集履歴
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入力
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test.csv
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```
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```csv
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日時,開催場所,主催会社,対応部署
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2017/3/5,KObe,M銀行,総務部
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```
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出力
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sorted_data.csv
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```csv
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日時,開催場所,主催会社,対応部署
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2017/3/3,Tokyo,S信託,総務部
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2017/3/4,Tokyo,M銀行,総務部
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2017/3/5,Tokyo,N証券,総務部
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2017/3/5,KObe,M銀行,総務部
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```
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3
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File without changes
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2
d
test
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@@ -59,3 +59,25 @@
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writer.writerows(data)
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```
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こちらで動作確認に使用した csv ファイル
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```python
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日時,開催場所,主催会社,対応部署
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2017/3/4,Tokyo,M銀行,総務部
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2017/3/4,Tokyo,S銀行,総務部
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2017/3/3,Tokyo,S信託,総務部
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2017/3/5,Tokyo,N証券,総務部
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2017/3/5,KObe,M銀行,総務部
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```
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1
d
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@@ -8,10 +8,54 @@
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8
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df = pd.read_csv('
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df = pd.read_csv('test.csv', parse_dates=['日時'], encoding='shift-jis')
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df = df.sort_values('日時')
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df.to_csv('sorted_data.csv', index=False)
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```
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## 追記
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csv モジュールを使うやり方
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```python
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import csv
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from datetime import datetime as dt
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data = []
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with open('test.csv', encoding='shift-jis') as f:
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reader = csv.reader(f)
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header = next(reader)
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data = list(reader)
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data = sorted(data, key=lambda x: dt.strptime(x[0], '%Y/%m/%d'))
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with open('sorted_data.csv', 'w') as f:
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writer = csv.writer(f)
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writer.writerow(header)
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writer.writerows(data)
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```
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