sys.path.insert cannnot import other python files

Question

What the title says. I have the following file structure inside the pathC:\Users\User\Desktop\all python file\5.0.8:

5.0.8\
   tree one\
      little main.py
      sample_tree1.py
   tree two\
       sample_tree2.py

the following is what's inside little main.py:

import sys
import sample_tree1

sys.path.insert(0, r'C:\Users\User\Desktop\all python file\5.0.8\tree two\sample_tree2.py')

import sample_tree2

I want to import sample_tree2.py, but an error is raised as soon as I run the little main.py:

Traceback (most recent call last):

  File "<ipython-input-1-486a3fafa7f2>", line 1, in <module>
    runfile('C:/Users/User/Desktop/all python file/5.0.8/tree one/little main.py', wdir='C:/Users/User/Desktop/all python file/5.0.8/tree one')

  File "C:\Users\User\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 786, in runfile
    execfile(filename, namespace)

  File "C:\Users\User\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/User/Desktop/all python file/5.0.8/tree one/little main.py", line 12, in <module>
    import sample_tree2

ModuleNotFoundError: No module named 'sample_tree2'

So what happened? I followed this post's top answer in order to import a file from another branch of path, but it doesn't work.

Thank you in advance

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EDIT:

I am looking for a solution that:

1) does not require changing the current working directory

2) does not require changing the names of the files

3) does not require changing the configuration of the python terminal stuff

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EDIT2: Added some capscreens of files and folder structures, and error messages

Answer 1

The sys.path.insert() command inserts a path into the system path and should not contain the filename.

Please try below using your structure:

little main.py:

import sys
import sample_tree1

sys.path.insert(0, r'/my/absolute/path/5.0.8/treetwo')
print(sys.path)  # view the path and verify your insert

import sample_tree2

print(sample_tree2.tree2_func())

sample_tree2.py in treetwo

def tree2_func():
    return 'called tree2'

Outputs:

['/my/absolute/path/5.0.8/treetwo', '... other paths']

called tree2