一些举例：

git+https://github.com/coleifer/peewee.git
git+https://github.com/coleifer/peewee.git@7ce1970e5f4559e2be99735dc7aef92310be04e0
[-e] git://git.myproject.org/MyProject.git@master#egg=MyProject

[-e] git://git.myproject.org/MyProject.git@v1.0#egg=MyProject

[-e] git://git.myproject.org/MyProject.git@da39a3ee5e6b4b0d3255bfef95601890afd80709#egg=MyProject