Hi, Following the thread on Pillow and Zope / PIL compatibility, I think I've found a solution that I hope will be acceptable for PIL.
Problem
=======
It's not really a Zope / PIL issue, but rather an easy_install / PIL one which
I think exposes a minor problem with PIL's setup.py which only shows up when
installing with easy_install::
$ tmp/bin/easy_install http://effbot.org/downloads/Imaging-1.1.7.tar.gz
...
Installed
/data/devel/pil/tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg
Processing dependencies for PIL==1.1.7
Finished processing dependencies for PIL==1.1.7
We're unable to ``import PIL``::
$ tmp/bin/python
Python 2.6.4 (r264:75706, Jan 26 2010, 20:09:19)
>>> import PIL
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named PIL
>>> import Image
>>>
When the egg is created by easy_install the contents are not within a PIL
subdirectory::
$ ls tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg
ArgImagePlugin.py ImageEnhance.py PalmImagePlugin.pyc
ArgImagePlugin.pyc ImageEnhance.pyc PcdImagePlugin.py
BdfFontFile.py ImageFile.py PcdImagePlugin.pyc
...
However, if we install without easy_install we get instead::
$ tar -zxf ~/Downloads/Imaging-1.1.7.tar.gz
$ tmp/bin/python Imaging-1.1.7/setup.py install
...
running install_lib
creating /data/devel/pil/tmp/lib/python2.6/site-packages/PIL
...
running install_egg_info
Writing
/data/devel/pil/tmp/lib/python2.6/site-packages/PIL/PIL-1.1.7-py2.6.egg-info
creating /data/devel/pil/tmp/lib/python2.6/site-packages/PIL.pth
And don't see a problem:
$ tmp/bin/python
Python 2.6.4 (r264:75706, Jan 26 2010, 20:09:19)
>>> import PIL
>>> import Image
>>>
Why does this happen?
=====================
To enable ``import Image`` to work, PIL's setup.py installs `Image.py` and
with the following options::
extra_path = "PIL",
package_dir = {"": "PIL"},
packages = [""],
As the `PIL` directory contains an `__init__.py`, ``from PIL import Image``
also works. This is a neat distutils hack, it just doesn't work for eggs.
How can this be fixed?
======================
Instead of making a subdirectory importable by magic, we can use a trick to
install PIL.pth::
package_data = {"PIL": ["../PIL.pth"]},
This means the PIL package can be installed normally::
ext_package = "PIL",
packages = ["PIL"],
Everything still ends up in the same place when you install with setup.py::
$ tmp/bin/python pil-setuptools-compat/setup.py install
...
running build_py
...
creating build/lib.macosx-10.6-i386-2.6/PIL
...
copying PIL/../PIL.pth -> build/lib.macosx-10.6-i386-2.6/PIL/..
running build_ext
...
running install_lib
creating /data/devel/pil/tmp/lib/python2.6/site-packages/PIL
...
copying build/lib.macosx-10.6-i386-2.6/PIL.pth ->
/data/devel/pil/tmp/lib/python2.6/site-packages
$ tmp/bin/python
Python 2.6.4 (r264:75706, Jan 26 2010, 20:09:19)
>>> import PIL
>>> import Image
>>>
But now when we install with easy_install::
$ tmp/bin/easy_install pil-setuptools-compat/
...
Installed
/data/devel/pil/tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg
Processing dependencies for PIL==1.1.7
Finished processing dependencies for PIL==1.1.7
The egg gets created with a PIL package::
$ ls tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg
EGG-INFO PIL PIL.pth
And we can now import PIL::
$ tmp/bin/python
Python 2.6.4 (r264:75706, Jan 26 2010, 20:09:19)
>>> import PIL
>>> import Image
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named Image
>>>
The ``import Image`` fails, because the PIL.pth is not directly in
`site-packages`. This doesn't seem to be a concern for PIL users who install
with easy_install / buildout :)
To run the tests, I copied the test script and images to another folder for
the imports to work correctly::
$ cd pil-setuptools-compat/
$ cp -R selftest.py Images ../tmp/
$ cd ../tmp/
$ bin/python selftest.py
--------------------------------------------------------------------
PIL 1.1.7 TEST SUMMARY
--------------------------------------------------------------------
Python modules loaded from
/data/devel/pil/tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg/PIL
Binary modules loaded from
/data/devel/pil/tmp/lib/python2.6/site-packages/PIL-1.1.7-py2.6-macosx-10.6-i386.egg/PIL
--------------------------------------------------------------------
--- PIL CORE support ok
--- TKINTER support ok
--- JPEG support ok
--- ZLIB (PNG/ZIP) support ok
--- FREETYPE2 support ok
*** LITTLECMS support not installed
--------------------------------------------------------------------
Running selftest:
--- 57 tests passed.
Code
====
Branch and test package at http://bitbucket.org/lrowe/pil-setuptools-compat
Sorry this has got so long! I wanted to avoid misunderstandings.
Laurence
pil-setuptools-compat.diff
Description: Binary data
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