• :file:`requirements/default.txt`

  Default requirements for Python 2.7 .

• :file:`requirements/test.txt`

  Requirements needed to run the full unittest suite via ./runtests.py

• :file:`requirements/pkgutils.txt`

  Extra requirements required to perform package distribution maintenance.

$ pip install -U -r requirements/default.txt

$ pip install -U -r requirements/default.txt
$ pip install -U -r requirements/test.txt