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<p>我正在制作一个<a href="https://filebin.net/sui2ljn1x1309tu1" rel="nofollow noreferrer">data frame</a>并试图找到其中的“?”的数目。CSV的某些部分:</p>
<pre><code>age,workclass,fnlwgt,education,education-num,marital-status,occupation,relationship,race,sex,capital-gain,capital-loss,hours-per-week,native-country,class
25, Private,226802, 11th,7, Never-married, Machine-op-inspct, Own-child, Black, Male,0,0,40, United-States, <=50K
38, Private,89814, HS-grad,9, Married-civ-spouse, Farming-fishing, Husband, White, Male,0,0,50, United-States, <=50K
28, Local-gov,336951, Assoc-acdm,12, Married-civ-spouse, Protective-serv, Husband, White, Male,0,0,40, United-States, >50K
44, Private,160323, Some-college,10, Married-civ-spouse, Machine-op-inspct, Husband, Black, Male,7688,0,40, United-States, >50K
18, ?,103497, Some-college,10, Never-married, ?, Own-child, White, Female,0,0,30, United-States, <=50K
34, Private,198693, 10th,6, Never-married, Other-service, Not-in-family, White, Male,0,0,30, United-States, <=50K
29, ?,227026, HS-grad,9, Never-married, ?, Unmarried, Black, Male,0,0,40, United-States, <=50K
</code></pre>
<p>我正在使用</p>
<pre><code>df.isin(['?']).sum(axis=0)
</code></pre>
<p>但是,对于所有列,它都返回0,尽管数据中有“?”</p>
<p>我怎么修理它</p>
<p>谢谢</p>