to have a landscape view in PKG and Module strucure
practice https://pyliaorachel.github.io/blog/tech/python/2017/09/15/pythons-import-trap.html
using
__init__.py (empty file)
$cd <pkg>
$ls
__init__.py qsModule.py qsModule.pyc to_import_a_module.py
QsPKG(as a root folder or PKG) ---- __init__.py
---- qsModuel.py (inclue a method)
---- to_import_a_module.py(to import other method from subling module)
$cd <root folder> #or <pkg name>
$cd QsPKG
#ls #see structure
$python3 -m < module_name > . <extention name>
$python3 -m qsMoule.py