回答編集履歴
1
コードの貼り付け間違いを修正
answer
CHANGED
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@@ -1,6 +1,12 @@
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1
1
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以下の方が速いと思います。
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2
2
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3
3
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```python
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4
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>>> def f(x):
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5
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... global number
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6
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... if not x:
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7
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... number += 1
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8
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... return number
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9
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...
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4
10
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>>> number = 0
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5
11
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>>>
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6
12
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>>> df2['number'] = (df1['name'] == df1['name'].shift()).apply(f)
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