回答編集履歴
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Update
test
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@@ -1,6 +1,8 @@
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```python
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df_count = df.groupby('state').apply(len).to_frame('count')
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df_count = df.groupby('state').count()['name'].to_frame('count')
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#df_count = df.groupby('state').count()['name'].to_frame('count')
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