To the best of my knowledge pip install .[extras_require here] has always worked. I can't find in any documentation when that feature was added, but I've never had any problem even on very old machines.
Is pip definitely the problem here. I could add 'pip install --upgrade pip', but I don't have merge rights to the repo that is currently having the problem.
From setup.py
extras_require={
'test': ['flake8', 'pytest>=2.9.0'],
},
In python 2.7.9
$ python --version
Python 2.7.9
$ pip --version
pip 6.0.7 from /home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages (python 2.7)
$ pip install .[test]
Collecting .[test]
Could not find any downloads that satisfy the requirement .[test]
No distributions at all found for .[test]
The command "pip install .[test]" failed and exited with 1 during .
From 3.5.2:
$ python --version
Python 3.5.2
$ pip --version
pip 9.0.1 from /home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages (python 3.5)
$ pip install .[test]
Processing /home/travis/build/Brian-Williams/repo_python
Collecting flake8 (from refactor-me==0.1.0)
Downloading flake8-3.3.0-py2.py3-none-any.whl (66kB)
100% |████████████████████████████████| 71kB 6.1MB/s
Requirement already satisfied: pytest>=2.9.0 in /home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages (from refactor-me==0.1.0)
Collecting pycodestyle<2.4.0,>=2.0.0 (from flake8->refactor-me==0.1.0)
Downloading pycodestyle-2.3.1-py2.py3-none-any.whl (45kB)
100% |███████████████���████████████████| 51kB 10.6MB/s
Collecting mccabe<0.7.0,>=0.6.0 (from flake8->refactor-me==0.1.0)
Downloading mccabe-0.6.1-py2.py3-none-any.whl
Collecting pyflakes<1.6.0,>=1.5.0 (from flake8->refactor-me==0.1.0)
Downloading pyflakes-1.5.0-py2.py3-none-any.whl (225kB)
100% |████████████████████████████████| 225kB 7.1MB/s
Requirement already satisfied: py>=1.4.29 in /home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages (from pytest>=2.9.0->refactor-me==0.1.0)
Installing collected packages: pycodestyle, mccabe, pyflakes, flake8, refactor-me
Running setup.py install for refactor-me ... - done
Successfully installed flake8-3.3.0 mccabe-0.6.1 pycodestyle-2.3.1 pyflakes-1.5.0 refactor-me-0.1.0
For your version of pip you need to run
pip install -e .[test]