[Python-Dev] Setting project home path the best way

Christian Tismer tismer at stackless.com
Fri Nov 16 12:32:46 CET 2012

Hi Daniel,

no, I was not aware of this. I just read it up on


Yeah, thank you very much for this hint, very useful! ;-)

cheers - Chris

On 16.11.12 04:22, Daniel Holth wrote:
> Are you familiar with executing directories having __main__.py as python scripts?
> Daniel Holth
> On Nov 15, 2012, at 4:43 PM, Christian Tismer <tismer at stackless.com> wrote:
>> Hi Kristjan,
>> does that mean that your scheme simply works, without any config step
>> necessary after I did my checkout?
>> This would in fact be an interesting alternative to
>>     Python setup.py develop
>> but I'm not sure if this is the same scheme on windows and Os X.
>> Getting this part right was rather tricky, and I fear this is still an issue.
>> Right now I think to just force my users to run the install step, since it is quite
>> accepted in general.
>> Still, I'd love to see a way with no action needed at all: write yout your structure,
>> and it works as-is. Seems to be impossible without tricks.
>> Cheers - chris
>> Sent from my Ei4Steve
>> On Nov 15, 2012, at 10:17, Kristján Valur Jónsson <kristjan at ccpgames.com> wrote:
>>> When python is being run from a compile environment, it detects this by looking for "Lib" folders in directories above the one containing the executable.
>>> (I always thought that this "special" execution mode, hardwired in, was a bit odd, and suggested that this could be made a function of pep405)
>>> Anyway, keeping your executable as part of the tree is the trick I use, and to make things nice I put  right next to it:
>>> site.py
>>> sitecustomize.py
>>> sitecustomize.py is where you would put the logic to set sys.path by walking up the hierarchy and finding the proper root.
>>> site.py is there to merely import sitecustomize.py, in case a site.py is not found in all the default places python looks.
>>> K
>>>> -----Original Message-----
>>>> From: Python-Dev [mailto:python-dev-
>>>> bounces+kristjan=ccpgames.com at python.org] On Behalf Of Christian Tismer
>>>> Sent: 11. nóvember 2012 20:31
>>>> To: python-dev at python.org
>>>> Subject: [Python-Dev] Setting project home path the best way
>>>> Hi friends,
>>>> I have a project that has its root somewhere on my machine.
>>>> This project has many folders and contains quite some modules.
>>>> There is a common root of the module tree, and I want to use
>>>> - either absolute imports
>>>> - relative imports with '.'
>>>> Problem:
>>>> - I want to run any module inside the heirarchy from the command-line
>>>> - this should work, regardless what my 'cwd' is
>>>> - this should work with or without virtualenv.
>>>> So far, things work fine with virtualenv, because sys.executable is in the
>>>> project module tree.
>>>> Without virtualenv, this is not so. But I hate to make settings like
>>>> PYTHONPATH, because these are not permanent. .
>>>> Question:
>>>> How should I define my project root dir in a unique way, without setting an
>>>> environment variable?
>>>> What is the lest intrusive way to spell that?
>>>> Reason:
>>>> I'd like to make things work correctly and unambigously when I call a script
>>>> inside the module heirarchy. Things are not fixed: there exist many
>>>> checkouts In the file system, and each should know where to search its
>>>> home/root in the tree.
>>>> Is this elegantly possible to deduce from the actually executed script file?
>>>> Cheers - chris
>>>> Sent from my Ei4Steve
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