英文:
Why, suddenly, importing the exact same python module as before became so slow?
问题
我正在运行一个调用本地模块（使用import导入）的Python脚本，但是在过去几天变得非常慢。
我找不到它变得如此缓慢的原因，无论是在其他Github帖子还是在Google上，这就是为什么我发帖的原因。
提供代码可能不会有太大帮助，但以下是引发问题的导入部分：
import latplan
其中latplan是此库
但是再次强调，以前这个导入一点问题都没有...
英文:
I am running a python script that calls local modules (with import), and since few days it became so slow.
I could not find the reason why it is so, neither on other Github posts or Google, that's why I am posting this.
Providing code won't be of much help, but here is the import that poses a problem:
import latplan
where latplan is this library
But again, this import did not pose any problem at all before...
答案1
得分: 2
import 语句在 Python 中可能非常慢，因为它们允许执行任意代码作为副作用；它们不仅仅是寻找 class 和 def 关键字。
现在，就像任何性能问题一样，如果没有进行分析，很难猜测到底是什么让它变得如此缓慢。幸运的是，有一个内置的、专门用于导入时间的分析器：
python -X importtime -c "import latplant"
我建议使用 tuna 来可视化报告。
英文:
import statements can be very slow in Python because they are allowed to execute arbitrary code as side effects; they don't just scoot for class and def keywords.
Now, as with any performance issue, it's hard to guess what exactly is taking so long without profiling. Luckily there's a builtin, specialised profiler for import time:
python -X importtime -c "import latplant"
I recommend using tuna to visualise the reports.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论