Incorrect import path for test module

[heibaiyanhuo]

The command python -m test.ThroughputTester always gives me a ModuleNotFoundError. I check the module path and find the reason is the Python interpreter will identify the module test as a built-in module instead of the module in playground. I get these path information when I use the interactive command line.

Here, though the test module and the playground module are all in the site-packages, the test module is identified as the built-in module.
The easiest way to solve the problem is to change a name for test, like playgroundtest. I don't know if others have this problem, but I test it on macOS and Ubuntu, the issues are the same.