Fail python import from another folder
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I am experimenting with python, mostly troubleshooting other people's code. I am trying to get a program to run,  "`path\folderA\program.py`". 

I am running the program from `path\folderA`

I am getting an error: 

    ImportError: No module named fff.ggg.ppp

program.py contains an import:

    from fff.ggg.ppp import mmm

In the folder "path\folderB" there are:
"`path\folderB\fff\__init__.py`"
"`path\folderB\fff\ggg`"

folder `ggg` also contains  `__init__.py`, as well as program `ppp.py`

From reading other posts, like http://stackoverflow.com/questions/338768/python-importerror-no-module-named I understand that having the `__init__.py` makes a folder a "package" which makes imports from it possible - but it doesn't work, since I am getting an error.

This has been working for other people that worked with these projects, so there is something wrong with my setup.

I read something about the directories having to be in the sys.path. Does that mean I have to add them to the environment variable path ? That would mean adding a lot of directories to the PATH though, so it can't be.

So I also found the following:

    import sys
    sys.path.append( <path to FolderB> )
But that means changing the code (which has not been necessary for other people) and hard-coding a path to what it is on my local machine - which I shouldn't have to, right ?

I can't visualize it - apparently I am not supposed to change the code and hard-code the physical path to the import module - so how can a program from folderA even know to look in folderB for an import ? 

How does the magic of `__init__.py` work ?