如何加速pytest [英] How to speed up pytest

问题描述

有没有办法加快pytest的重复执行?似乎花费了大量时间收集测试，即使我在命令行上指定要执行哪些文件.我知道这也不是磁盘速度问题，因为在所有 .py 文件中运行 pyflakes 非常快.

Is there some way to speed up the repeated execution of pytest? It seems to spend a lot of time collecting tests, even if I specify which files to execute on the command line. I know it isn't a disk speed issue either since running pyflakes across all the .py files is very fast.

各种答案代表了 pytest 变慢的不同方式.他们有时有所帮助，而在其他方面则没有.我正在添加一个解释常见速度问题的答案.但是不可能选择The"在这里回答.

The various answers represent different ways pytest can be slow. They helped sometimes, did not in others. I'm adding one more answer that explains a common speed problem. But it's not possible to select "The" answer here.

推荐答案

使用 pytest.ini 或 tox.ini 中的 norecursedirs 选项可以节省大量收集时间，具体取决于您的其他文件在您的工作目录中.当我有一套 300 次测试时，我的收集时间大约减半(0.34 秒对 0.64 秒).

Using the norecursedirs option in pytest.ini or tox.ini can save a lot of collection time, depending on what other files you have in your working directory. My collection time is roughly halved for a suite of 300 tests when I have that in place (0.34s vs 0.64s).

如果您已经像我一样使用 tox，您只需要添加您的 tox.ini 中的以下内容:

If you're already using tox like I am, you just need to add the following in your tox.ini:

[pytest]
norecursedirs = docs *.egg-info .git appdir .tox

您也可以将其添加到独立的 pytest.ini 文件中.

You can also add it in a free-standing pytest.ini file.

pytest 文档有关于 pytest 配置文件的更多详细信息.

The pytest documentation has more details on pytest configuration files.

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