setup.py,setup.cfg, extra_require (not using pip)

python memo

e.g. colander
setup.py

##... snip

testing_extras = ['nose', 'coverage']
docs_extras = ['Sphinx']

setup(name='colander',
      version='0.9.8',
## ... snip
      install_requires = requires,
      test_suite="colander",
      extras_require = {
          'testing':testing_extras,
          'docs':docs_extras,
          },
      )

setup.cfg

## ... snip
[aliases]
dev = develop easy_install colander[testing]
docs = develop easy_install colander[docs]
## .. snip

how to use

$ python setup.py dev # install package include testing requirements
$ python setup.py docs # instapp package for documantation

e.g.

https://github.com/Pylons/colander/blob/master/setup.py
https://github.com/Pylons/colander/blob/master/setup.cfg