質問編集履歴
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@@ -3,9 +3,8 @@
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```python
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import pandas as pd
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import numpy as np
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data =
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data = {"user":["a","b","c","a","a"],"num":[5,6,7,8,9]}
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df = pd.DataFrame(data)
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df.columns = ["user","num"]
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```
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このときに例えば,user列のaについてのnum列の平均をとりたい場合は
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