[Virtual Env] Python build environment without anaconda (Windows edition)

When writing python some will use Conda for managing environment. for now I just notice Python also has build-in environment management tool name (virtual environment). so let get started.

Prerequisite
- install python 3.x
- add path in environment variable for call only “python”

1. Generate virtual environment folder
   python -m venv ./venvnaja
   this will generate venvnaja folder in current directory.
   note ** I use -naja suffix for mark as name. that mean “You can change as wanted”
2. activate environment via powershell and type
   venvnaja/Script/activate.ps1
3. try install package e.g. Pandas ,Numpy
4. export current package version for install later
   pip freeze > requirement.txt
   this will create requirement.txt in current directory
5. for reinstall again package with defined requirement.txt (form 4) for test it work. You can try by delete all pandas folder in venvnaja/Lib for test reinstall package is work.
   for reinstall package command
   pip install -r ./requirement.txt

note for prevent forgot “eiei” byeeeeee