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@@ -4,6 +4,23 @@
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[Pandasで2つのデータを横方向に結合するmerge関数の使い方 - DeepAge](https://deepage.net/features/pandas-merge.html)
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```csv
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列1,列2,列3
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1,a,b
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2,b,b
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3,c,b
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```
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test1.csv
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```csv
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列1,列2
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1,b
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2,b
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```
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test2.csv
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```python
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import pandas as pd
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