擅长:python、mysql、java
<p>或<code>loc</code>:</p>
<pre><code>df['NEW'] = df['Day']
df.loc[df['Food'].eq('pasta'), 'NEW'] = df['Time']
print(df)
</code></pre>
<p>输出:</p>
<pre><code> Day Food Time NEW
0 3 pizza 8 3
1 4 pasta 9 9
2 5 pizza 10 5
</code></pre>