[Python] vscode do not find my custom python package

I'm new to VS Code for python development on Windows and my pylint cannot find a package. This is my project directory structure.

workspace/ <- This is VS Code workspace (E:\workspace)
.vscode/
launch.json
settings.json
project1/
mypackge/
__init__.py <- In here, I wrote: `import mypackage.first_sub_pkg`
first_sub_pkg/
__init__.py <- In here, I wrote: `from .second_sub_pkg.mymodule import MyClass`
second_sub_pkg/
__init__.py <- In here, I wrote: `from .mymodule import MyClass`
mymodule.py <- This module has class: `MyClass`
test_script/
mytest.py
project2/
etc.../


And I wrote the mytest.py script code like:

from mypackge.first_sub_package import MyClass


I'm using C:/Anaconda3/python.exe for python interpreter

When I click the button on the upper side ▷ (Run Python File in Terminal) on the upper right side of VS Code, I get this error message

PS E:\workspace> & c:/Anaconda3/python.exe e:/workspace/project1/test_script/mytest.py
Traceback (most recent call last):
File "e:/workspace/project1/test_script/mytest.py", line 1, in <module>
from first_sub_pkg.second_sub_pkg import MyClass
ModuleNotFoundError: No module named 'first_sub_pkg'


Also, I added workspace/.vscode/launch.json like:

{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Python: Current File",
"type": "python",
"request": "launch",
"program": "${file}",
"console": "integratedTerminal",
"pythonPath": "${commandython.interpreterPath}",
"env": {
"PYTHONPATH": "${workspaceFolder};E:/workspace/project1"
}
}
]
}


And workspace/.vscode/settings.json like:

{
"python.autoComplete.extraPaths": [
"E:/workspace",
"E:/workspace/project1",
"E:/workspace/project1/first_sub_pkg",
],
"python.pythonPath": "c:/Anaconda3/python.exe",
"terminal.integrated.shell.windows": "C:/windows/System32/WindowsPowerShell/v1.0/powershell.exe",
"python.linter": "pyLint",
"python.linting.pylintPath": "pylint"
}


And my user settings.json file is like:

{
"python.autoComplete.extraPaths": [
"E:/workspace",
"E:/workspace/project1",
"E:/workspace/project1/first_sub_pkg",
]
}


I already ran this test script in Eclipse + pydev environment, and there was no problem running it. But somehow VSC cannot import my modules.

I seems like system path problem since it works well when I run python and append 'E:/workspace/project1' to system path (import sys; sys.path.append('E:/workspace/project1'), but I cannot find out how to solve the problem. (Adding system variables in Windows settings did not worked neither).

What did I miss? Somebody please help me. I searched for 2 days but got nowhere.

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