擅长:python、mysql、java
<p>这里的python等价物是一个内联<code>if else</code>表达式(或<a href="https://www.pythoncentral.io/one-line-if-statement-in-python-ternary-conditional-operator/" rel="nofollow noreferrer">ternary operator</a>):</p>
<pre><code>ifelse(col2 == 'c', col1 - 2, col1 + 4)
</code></pre>
<p>就会变成</p>
^{pr2}$