bundle python package to win exe (support pandas)

bundle.bat

@echo off

if not exist venv/ call init.bat
call venv\Scripts\activate.bat
pyinstaller -F main.py --hidden-import=pandas._libs.tslibs.timedeltas
call venv\Scripts\deactivate.bat
rd /s/q build

init.bat

@echo off

set PYTHON_CMD=python
where /q python3
if "%ERRORLEVEL%" == "0" (
  set PYTHON_CMD=python3
  goto :INITIALIZE
)
where /q python
if "%ERRORLEVEL%" == "1" (
  echo Please install python!
  goto :EOF
)

:INITIALIZE

%PYTHON_CMD% -c "import venv"
if "%ERRORLEVEL%" == "1" (
  %PYTHON_CMD% -m pip install virtualenv
  %PYTHON_CMD% -m virtualenv venv
) else (
  %PYTHON_CMD% -m venv venv
)

call venv\Scripts\activate.bat
pip install -r requirements.txt

launch-venv.bat

@echo off

if not exist venv/ call init.bat
cmd /k venv\Scripts\activate.bat