If you just want to use the library (not contribute to it), check out the official documentation: http://GoogleCloudPlatform.github.io/gcloud-python/

Start by cloning the repository:

$ git clone git://github.com/GoogleCloudPlatform/gcloud-python.git
$ cd gcloud
$ python setup.py develop

Chances are you have some dependency problems, if you're on Ubuntu, try installing the pre-compiled packages:

$ sudo apt-get install python-crypto python-openssl libffi-dev

or try installing the development packages (that have the header files included) and then pip install the dependencies again:

$ sudo apt-get install python-dev libssl-dev libffi-dev

Make sure you have sphinx installed and:

$ git clone git://github.com/GoogleCloudPlatform/gcloud-python.git
$ pip install sphinx
$ cd gcloud-python/docs
$ make html

Make sure you have nose installed and:

$ git clone git://github.com/GoogleCloudPlatform/gcloud-python.git
$ pip install unittest2 nose
$ nosetests