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Install packages from git repo using pip

Packages in git repo (or hg, svn, bzr) can be installed with "pip install -e" directly. Base on the help message of "pip install", we have

  -e VCS+REPOS_URL[@REV]#egg=PACKAGE, --editable=VCS+REPOS_URL[@REV]#egg=PACKAGE
                        Install a package directly from a checkout. Source
                        will be checked out into src/PACKAGE (lower-case) and
                        installed in-place (using setup.py develop). You can
                        run this on an existing directory/checkout (like pip
                        install -e src/mycheckout). This option may be
                        provided multiple times. Possible values for VCS are:
                        svn, git, hg and bzr.


To use it, first make sure you have git installed. Such as "sudo apt-get install git-core" on ubuntu. And then you may follow the below examples(install redis-py):

# Install from master
pip install -e git+https://github.com/andymccurdy/redis-py.git#egg=redis-py
# Install a branch
pip install -e git+https://github.com/andymccurdy/redis-py.git@pubsub#egg=redis-py
# Install a tag
pip install -e git+https://github.com/andymccurdy/redis-py.git@2.8.0#egg=redis-py
# Install a commit
pip install -e git+https://github.com/andymccurdy/redis-py.git@90ba027#egg=redis-py

Base on this post in stackoverflow, you may also specify a line in the requirment file(like reqs.txt):

-e git+https://github.com/andymccurdy/redis-py.git@90ba027#egg=redis-py

And then, install it with "pip install -r reqs.txt".
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