'ls' is not recognized as an internal or external command, operable program or batch file. in pycharm code example

Example 1: '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

Example 2: batch 'else' is not recognized as an internal or external command, operable program or batch file.

if exist "%userprofile%\.android\avd\%avdName%.avd" (
   msg %username% 'true'
) else (
   msg %username% 'false'
)