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Why does nunique overwrite the grouping column in pandas
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| import pandas as pd | |
| import numpy as np | |
| df = pd.DataFrame({'user_id':[1,1,1,2,2,2],'module_id':[1,2,3,1,1,2]}) | |
| print(df) | |
| print(df.groupby('user_id', as_index=False).sum()) | |
| print(df.groupby('user_id', as_index=False).nunique()) |
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