擅长:python、mysql、java
<p>它们是<strong>同时运行的</strong>,只是不<strong>同时执行</strong>。迭代可能是交错的。引用Python:</p>
<blockquote>
<p>The mechanism used by the CPython interpreter to assure that only one thread <strong>executes</strong> Python <strong>bytecode</strong> at a time.</p>
</blockquote>
<p>因此两个<code>for</code>循环可能同时运行,因此不会(例如)同时运行两个<code>del dict[index]</code>。在</p>