windows 'pyinstaller' is not recognized as an internal or external command, operable program or batch file. code example

Example: 'pyinstaller' is not recognized as an internal or external command, operable program or batch file.

# if you're getting this error :
# 'pyinstaller' is not recognized as an internal or external command, operable program or batch file.
# then just write this in CMD:
pip install pyinstaller