The gcloud library is pip install-able:

$ pip install gcloud

If you have trouble installing pycrypto or pyopenssl (and you're on Ubuntu), you can try install the precompiled packages:

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

If you want to install everything with pip, try installing the dev packages beforehand:

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

If you want to install gcloud-python from source, you can clone the repository from GitHub:

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