As 'setuptools' is a dependency 'pkg_resources' will be available always. Ref:...

As 'setuptools' is a dependency 'pkg_resources' will be available always. Ref: http://mail.zope.org/pipermail/zope-dev/2009-March/035277.html

src/zope/__init__.py

-# this is a namespace package
-try:
-    import pkg_resources
-    pkg_resources.declare_namespace(__name__)
-except ImportError:
-    import pkgutil
-    __path__ = pkgutil.extend_path(__path__, __name__)
+__import__('pkg_resources').declare_namespace(__name__)