[Pythonmac-SIG] PIL and py2app on Leopard

[Christopher Barker]

Sorry, I've lost track of this thread a bit, but I'm going to try to 
give some general advice -- sorry if I repeat stuff you've already 
said/tried:

>> import Image
> 
> that throws an error that the module is not found even without wrapping
> is it the recommendation for py2app or for python general?

Yes, that is how PIL is usually imported, so you'll have an easier time 
getting your install fixed first. Indeed, when I started using PIL, 
"import Image" was the only option.

I've just looked at my install, which is from the PIL package on 
pythonmac.org/packages. in site-packages, there is a directory called 
"PIL". It is a package (it has an __init__.py), but it is also added to 
the sys.path by the addition of a PIL.pth file. So you should be able to 
import it either way, but perhaps "from PIL import Image" is confusing 
py2app.

>> This requires that PYTHONPATH is set up to find the module.

not quite -- just to get the terminology straight -- PYTHONPATH is an 
environment variable in which one can specify additional paths you want 
Python to search for packages/modules.

sys.path is the set of paths used by python to find stuff -- it is built 
at initialization from a number of sources, of which PYTHONPATH is only 
one. In addition, you can add paths to sys.path yourself, in your code, 
at runtime.

I've never had a need to use PYTHONPATH, and I don't recommend it -- 
Environment variables are different depending on how your script is run, 
and there is only one PYTHONPATH, even though there may be multiple 
version of python on your system.

> obviously it is missing how do I add it?

Odd -- how did you install PIL? Anyway, there should be a file in

/Library/Python/2.5/site-packages

called "PIL.pth", and in there, should be the single line" "PIL". This 
assumes that PIL is installed in:

/Library/Python/2.5/site-packages/PIL

That should add it to your path.

Now on to py2app:

Py2app is supposed to read your code and determine what modules/packages 
are needed, an include those automatically. Some packages need special 
attention to be included correctly. PIL is one of those. In this case, 
there are built-in "recipes" that should get triggered when you use a 
given package, and it will do some extra stuff for you. There is a PIL 
recipe in:

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/py2app-0.4.2-py2.5.egg/py2app/recipes/PIL

That should "do the right thing" with PIL.

If it isn't working, then it's broken, and hopefully one of the folks 
here can figure it out and fix it.

So, for your situation, I recommend:

1) Get PIL installed so that "import Image" works.

2) make a little script that does little else but "import image" and 
some little action to test it.

3) build a simple py2app setup.py, like:

from setuptools import setup

setup(
     app="MyScript.py",
     setup_requires=['py2app'],
)

Should do it.

And you might want to try it with both: "import Image" and "from PIL 
import Image", 'cause it looks like both should work.

That should "just work". If it doesn't:

Report back what you get, and be sure to include:

Your script
Your setup.py
Your OS-X version
Your Python version (where you got it, how you installed it)
Your py2app version
Your PIL version (where you got it, how you installed it)

-Chris


-- 
Christopher Barker, Ph.D.
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