text: At 03:02 PM 10/1/2007 -0600, zooko wrote: >The full version is here: > > > >The short version is that if you run ./setup.py install --single- >version-externally-managed from the zope.interface 3.4.0 source tree, >you'll get everything you need to import zope.interface except for >the "zope/__init__.py" file. > >Is this a bug in setuptools? --single-version-externally-managed is intended for installation in site-packages, especially by system packages. It thus *cannot* install the __init__.py without conflicting with other system packages that include code that's part of the same namespace package. Thus, it installs a .pth file to work around the absence of the __init__.py Unfortunately, this doesn't work if you install to a location that doesn't support .pth files. If you are installing to a PYTHONPATH directory, you need to install setuptools' special 'site.py' to make that directory function in the same way that site-packages does. Please remember that --single-version-externally-managed option is intended primarily for the benefit of system packaging tools. Routine or even manual use is not recommended, because it's not manageable without some kind of management tool. Hence the phrase, "externally managed". :)