擅长:python、mysql、java
<p>用途:</p>
<pre><code>df.loc[df['EstimatedSalary']< 21000, 'EstimatedSalary'] = 0
</code></pre>
<p>或:</p>
<pre><code>df['EstimatedSalary'] = df['EstimatedSalary'].mask(df['EstimatedSalary'] < 21000, 0)
</code></pre>
<p>或:</p>
<pre><code>df['EstimatedSalary'] = np.where(df['EstimatedSalary'] < 21000, 0, df['EstimatedSalary'])
print (df)
D Gender Age EstimatedSalary Purchased
0 15624510 Male 19 0 0
1 15810944 Male 35 0 0
2 15668575 Female 26 43000 0
3 15603246 Female 27 57000 0
</code></pre>