Create and import a custom python package - import doesn't work in the root -

i'm totally new python, , want create first python library peronal uses.

i'm using python 2.7.5, , running idle interface.

so far, understood documentation , related questions that:

• python goes through list of directories listed in sys.path find scripts , libraries
• the package directory must contain __init__.py file, can empty
• the module want create should modulename.py file code inside package directory

(sources: http://www.johnny-lin.com/cdat_tips/tips_pylang/path.html --- https://docs.python.org/2/tutorial/modules.html)

and here tried fails:

• created personal package directory c:\....\pythonlibs
• created subpackage dir c:\....\pythonlibs\package
• created __init__.py file inside both folders
• created mymodule.py file in packacge dir

and in idle used code:

import sys      sys.path.append(r'c:\....\pythonlibs') 

first issue:

currently have append every time enter idle. how can keep directory in sys.path permanently there lot of other directories there?

then tried importing package:

import pythonlibs #fails!! why?       import pythonlibs.package #fails!! why?        import package #works      

the error is: importerror: no module named pythonlibs

second issue?

this seems against documentation, why can't import root pythonlibs folder?

with line

sys.path.append(r'c:\....\pythonlibs') 

you instructing interpreter start looking modules (libraries) in directory. since directory not contain pythonlibs folder (the parent does), can't import it.

similarly - because contains module package, can import it.