Estou usando namespaces com setuptools para distribuir um mesmo módulo em dois repositórios diferentes. O objetivo é obtermymodule.one emymodule.two instalado, sabendo que o conteúdo deone etwo vem de diferentes repositórios. Mas parece doissetup.py varra o conteúdo um do outro.

├── repo1
│   ├── mymodule
│   │   ├── __init__.py
│   │   └── one
│   │       └── __init__.py
│   └── setup.py
└── repo2
    ├── mymodule
    │   ├── __init__.py
    │   └── two
    │       └── __init__.py
    └── setup.py

O espaço para nome tem o__init__.py abaixo:

test$ cat repo1/mymodule/__init__.py 
from pkgutil import extend_path
__path__ = extend_path(__path__, __name__)

test$ cat repo2/mymodule/__init__.py 
from pkgutil import extend_path
__path__ = extend_path(__path__, __name__)

osetup.py declara o mesmo nome:

test$ cat repo1/setup.py 
#!/usr/bin/env python
from setuptools import setup, find_packages
setup(name='mymodule', packages=find_packages())

test$ cat repo2/setup.py 
#!/usr/bin/env python
from setuptools import setup, find_packages
setup(name='mymodule', packages=find_packages())

A instalação do módulo a partir do primeiro pacote permite importá-lo com sucesso:

test/repo1$  sudo python3 setup.py install
running install
Checking .pth file support in /usr/local/lib/python3.4/dist-packages/
/usr/bin/python3 -E -c pass
TEST PASSED: /usr/local/lib/python3.4/dist-packages/ appears to support .pth files
running bdist_egg
running egg_info
writing dependency_links to mymodule.egg-info/dependency_links.txt
writing mymodule.egg-info/PKG-INFO
writing top-level names to mymodule.egg-info/top_level.txt
reading manifest file 'mymodule.egg-info/SOURCES.txt'
writing manifest file 'mymodule.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
creating build/bdist.linux-x86_64/egg
creating build/bdist.linux-x86_64/egg/mymodule
copying build/lib/mymodule/__init__.py -> build/bdist.linux-x86_64/egg/mymodule
creating build/bdist.linux-x86_64/egg/mymodule/one
copying build/lib/mymodule/one/__init__.py -> build/bdist.linux-x86_64/egg/mymodule/one
byte-compiling build/bdist.linux-x86_64/egg/mymodule/__init__.py to __init__.cpython-34.pyc
byte-compiling build/bdist.linux-x86_64/egg/mymodule/one/__init__.py to __init__.cpython-34.pyc
creating build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/PKG-INFO -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/SOURCES.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
zip_safe flag not set; analyzing archive contents...
mymodule.__pycache__.__init__.cpython-34: module references __path__
creating 'dist/mymodule-0.0.0-py3.4.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing mymodule-0.0.0-py3.4.egg
creating /usr/local/lib/python3.4/dist-packages/mymodule-0.0.0-py3.4.egg
Extracting mymodule-0.0.0-py3.4.egg to /usr/local/lib/python3.4/dist-packages
Adding mymodule 0.0.0 to easy-install.pth file

Installed /usr/local/lib/python3.4/dist-packages/mymodule-0.0.0-py3.4.egg
Processing dependencies for mymodule==0.0.0
Finished processing dependencies for mymodule==0.0.0

Aqui está a importação:

test/$ ipython3
Python 3.4.3 (default, Oct 14 2015, 20:28:29) [...]

In [1]: from mymodule import [TAB]
extend_path  one    

Agora instalamos a outra parte do espaço para nome do segundo repositório:

test/repo2$ sudo python3 setup.py install
running install
Checking .pth file support in /usr/local/lib/python3.4/dist-packages/
/usr/bin/python3 -E -c pass
TEST PASSED: /usr/local/lib/python3.4/dist-packages/ appears to support .pth files
running bdist_egg
running egg_info
creating mymodule.egg-info
writing mymodule.egg-info/PKG-INFO
writing top-level names to mymodule.egg-info/top_level.txt
writing dependency_links to mymodule.egg-info/dependency_links.txt
writing manifest file 'mymodule.egg-info/SOURCES.txt'
reading manifest file 'mymodule.egg-info/SOURCES.txt'
writing manifest file 'mymodule.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
creating build
creating build/lib
creating build/lib/mymodule
copying mymodule/__init__.py -> build/lib/mymodule
creating build/lib/mymodule/two
copying mymodule/two/__init__.py -> build/lib/mymodule/two
creating build/bdist.linux-x86_64
creating build/bdist.linux-x86_64/egg
creating build/bdist.linux-x86_64/egg/mymodule
copying build/lib/mymodule/__init__.py -> build/bdist.linux-x86_64/egg/mymodule
creating build/bdist.linux-x86_64/egg/mymodule/two
copying build/lib/mymodule/two/__init__.py -> build/bdist.linux-x86_64/egg/mymodule/two
byte-compiling build/bdist.linux-x86_64/egg/mymodule/__init__.py to __init__.cpython-34.pyc
byte-compiling build/bdist.linux-x86_64/egg/mymodule/two/__init__.py to __init__.cpython-34.pyc
creating build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/PKG-INFO -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/SOURCES.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying mymodule.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
zip_safe flag not set; analyzing archive contents...
mymodule.__pycache__.__init__.cpython-34: module references __path__
creating dist
creating 'dist/mymodule-0.0.0-py3.4.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing mymodule-0.0.0-py3.4.egg
removing '/usr/local/lib/python3.4/dist-packages/mymodule-0.0.0-py3.4.egg' (and everything under it)
creating /usr/local/lib/python3.4/dist-packages/mymodule-0.0.0-py3.4.egg
Extracting mymodule-0.0.0-py3.4.egg to /usr/local/lib/python3.4/dist-packages
mymodule 0.0.0 is already the active version in easy-install.pth

Installed /usr/local/lib/python3.4/dist-packages/mymodule-0.0.0-py3.4.egg
Processing dependencies for mymodule==0.0.0
Finished processing dependencies for mymodule==0.0.0

Mas tentando importarone novamente falha desdetwo jogou na lixeira:

test/,$ ipython3
Python 3.4.3 (default, Oct 14 2015, 20:28:29) [...]

In [1]: from mymodule import [TAB]
extend_path  two   

In [1]: from mymodule import one
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-ddf1c613e57c> in <module>()
----> 1 from mymodule import one

ImportError: cannot import name 'one'