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- A B
- 1 21
- 0 21
- 0 21
- 1 25
- 1 28
- 0 28
- A B
- 1 21
- 0 21
- NAN 21
- 1 25
- 1 28
- 0 28
- df['A'] = np.where((df['A'].isnull()) & (df['B'] ==df['B'].shift()),0,df['A'])
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