root@17d2a99469e3:~# mkdir foo
root@17d2a99469e3:~# cd foo
root@17d2a99469e3:~/foo# pip install -e 'git+https://github.com/pypa/sampleproject#egg=sample'
Obtaining sample from git+https://github.com/pypa/sampleproject#egg=sample
  Cloning https://github.com/pypa/sampleproject to ./src/sample
Collecting peppercorn (from sample)
  Downloading peppercorn-0.5.tar.gz
Building wheels for collected packages: peppercorn
  Running setup.py bdist_wheel for peppercorn ... done
  Stored in directory: /root/.cache/pip/wheels/d3/86/5f/8a590bb8d2c95024b7dd0c01d348549818324f37b523589f70
Successfully built peppercorn
Installing collected packages: peppercorn, sample
  Running setup.py develop for sample
Successfully installed peppercorn-0.5 sample
You are using pip version 8.1.2, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
root@17d2a99469e3:~/foo# ls
src
root@17d2a99469e3:~/foo# ls src/
pip-delete-this-directory.txt  sample
root@17d2a99469e3:~/foo#