Am 12.09.2014 21:24, schrieb Eric V. Smith:
[Oops, replying to the list this time. Sorry for the dupe, Thomas.]
On 9/12/2014 3:14 PM, Thomas Heller wrote:
So it seems that it is a bug in setuptools: It must not create or
install these pth files when installing in Python 3.3 or newer (which
implement PEP 420).
PEP 420 goes out of its way to support pkgutil.extend_path():
http://legacy.python.org/dev/peps/pep-0420/#migrating-from-legacy-namespace-packages
So it should be possible for some cross-version code to work.
My point is that the source code for zope.interface (for example) has
the magic code in the zope/__init__.py file, right beneath the
zope/interface/ directory:
"""
try:
import pkg_resources
pkg_resources.declare_namespace(__name__)
except ImportError:
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)
"""
IMO this is to support the legacy way.
See:
https://github.com/zopefoundation/zope.interface/blob/master/src/zope/__init__.py
However, when installing it in Python 3.4, this __init__.py file is NOT
installed. Instead, the 'zope' directory ONLY contains the 'interface'
subdirectory with all the code. But a .pth file is installed that does
the strange things that I mentioned in the original post.
Thomas
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