擅长:python、mysql、java
<blockquote>
<p>C/C++ is well known for being in many cases faster than python.</p>
</blockquote>
<p>不是在很多情况下,<em>总是</em></p>
<p>当然,如果您的C/C++代码编写得很糟糕,那么它的速度可能会很慢</p>
<blockquote>
<p>I performed the test both in python using the built-in json library and in C++ using the external nlohmann JSON library.</p>
</blockquote>
<p><code>nlohmann</code>JSON库比其他替代方法慢。它很可能比CPython的实现慢。如果需要速度,请使用其他库</p>
<p>话虽如此,请注意基准测试很难。可能的情况是,正如@杰斯珀和@ IDCelv所提到的,编译C++代码时,你只会缺少优化。p>
<blockquote>
<p>is the json library by any chance written in any low level language and this is the main reason for performance, or is just pure python?</p>
</blockquote>
<p>是的,正如@jornsharpe所指出的,CPython实现是<a href="https://github.com/python/cpython/blob/master/Modules/_json.c" rel="nofollow noreferrer">written in C</a></p>