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<pre><code>import pandas as pd
import numpy as np
dt=pd.DataFrame({'schoolNum':['12','13','14','13'],'oldDistrict':['A','B', 'C','B'],'newDistrict':['F',' ','G',' ']})
dt=pd.DataFrame({'schoolNum':['12','13','14','13'],'oldDistrict':['A','B', 'C','B'],'newDistrict':['F','B','G','B']})
</code></pre>
<p>我试过:</p>
<pre><code>dt.ix[dt['oldDistrict']=='13', 'newDistrict']=dt.oldDistrict
</code></pre>
<p>但我收到一条关于axis的错误信息。你知道吗</p>