回答編集履歴
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追記
test
CHANGED
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@@ -29,3 +29,29 @@
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#2 5 z
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```
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pandasのみの例です。
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```Python
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import pandas as pd
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main_df = pd.DataFrame({'unique_id':[1,2,3,4],'val':list('abcd')})
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new_df = pd.DataFrame({'unique_id':[3,4,5],'val':list('xyz')})
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df = new_df[~new_df['unique_id'].isin(main_df['unique_id'])]
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print(df)
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# unique_id val
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#2 5 z
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```
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