Received 'can't find '__main__' module in '<packageName>' with python package

I can easily replicate your problem, actually even without using your package:

$ python empty
.env/bin/python: can't open file 'empty': [Errno 2] No such file or directory
$ mkdir empty
$ python empty
.env/bin/python: can't find '__main__' module in 'empty'
$ python Empty
.env/bin/python: can't find '__main__' module in 'Empty'

So you are not calling your library at all, you are just giving the Python interpreter a nonexistent script name, which in case there is a like-named directory (case-insensitive even) in the working directory it tries to execute it.

I was able to install your package from PyPi just fine and can import it alright, but there doesn't seem to be any entry point to it, nothing useful is exported at the top level and no executable scripts are added to Python bin:

>>> import etltest
>>> dir(etltest)
['__author__', '__builtins__', '__doc__', '__file__', '__name__', '__package__',
'__path__', '__version__']

Running the etlTest.py directly as suggested in Quickstart from your docs doesn't work either:

$ python .env/lib/python2.7/site-packages/etltest/etlTest.py
2014-07-13 17:19:56,831 - settings - DEBUG - Attempting to load .env/lib/python2.7/site-packages/.etltest-settings.yml
2014-07-13 17:19:56,832 - settings - WARNING - No such file or directory .env/lib/python2.7/site-packages/.etltest-settings.yml
2014-07-13 17:19:56,832 - settings - DEBUG - Attempting to load .env/lib/python2.7/site-packages/.etltest-settings.yml
2014-07-13 17:19:56,832 - settings - WARNING - No such file or directory .env/lib/python2.7/site-packages/.etltest-settings.yml
2014-07-13 17:19:56,832 - settings - WARNING - Could not find settings file in .env/lib/python2.7/site-packages/.etltest-settings.yml,.env/lib/python2.7/site-packages/.etltest-settings.yml. Using defaults where present.
Traceback (most recent call last):
  File ".env/lib/python2.7/site-packages/etltest/etlTest.py", line 73, in <module>
    main(sys.argv[1:])
  File ".env/lib/python2.7/site-packages/etltest/etlTest.py", line 22, in main
    SettingsManager().first_run_test()
  File ".env/lib/python2.7/site-packages/etltest/utilities/settings_manager.py", line 29, in __init__
    self.app_name = etltest_config['app_name']
KeyError: 'app_name'

I'd say your package is not apt for ditribution yet. You might want to clean up some dependencies on your development environment and read upon setuptools entry points to provide proper command line executables along with your package. Also it shouldn't run in debug mode by default if it's not some kind of a testing release.

I recently got the same issue and finaly find the solution by my self. So as the error said, I added a file __main__.py at the same path that my __init__.py.

Inside __main__.py I added the following code :

 from mypackage.mymodule import main 
      main() 

main() was the main function of my code. And it's works now.

here my directory:

package 
|__dirpackage
   |_mypackage.py
   |_ __init__.py
   |_ __main__.py
|_setup.py`