[Python] Style file not found in the style library and input is not a valid URL or path, when...

I have a customized matplotlib style file, called "mystyle.mplstyle".

In the same folder, I have test.py with the following code:

import matplotlib.pyplot as plt
plt.style.use('mystyle.mplstyle')


That test.py file runs fine.

But if in a second test2.py file in the same folder, I run the following code:

import test


It would generate the following error messages:

Traceback (most recent call last):
File "C:/Users/.../test2.py", line 1, in
import test
File "C:\Users...\test.py", line 3, in
plt.style.use('mystyle.mplstyle')
File "C:\ProgramData\Anaconda3\envs...\lib\site-packages\matplotlib\style\core.py", line 130, in use
raise IOError( OSError: 'mystyle.mplstyle' not found in the style library and input is not a valid URL or path; see style.available for list of available styles
​

Why is that? How to fix the import?

Many thanks!!

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