擅长:python、mysql、java
<p>由于<code>sub_folder</code>不在<code>PYTHONPATH</code>中,因此需要使用来自<code>a.py</code>的<a href="https://realpython.com/absolute-vs-relative-python-imports/#relative-imports" rel="nofollow noreferrer">relative import</a>:</p>
<pre><code>from . import b
b.print_value()
</code></pre>