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df = pd.DataFrame({'a': [np.NaN, np.NaN, 1], 'b': [np.NaN, 1, 1]})
df['a'] == df['b']
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0 False
1 False
2 True
dtype: bool
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0 NaN
1 NaN
2 1
dtype: float
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0 NaN
1 NaN
2 True
dtype: bool