TextRank is a key phrase and sentence extraction algorithm based on PageRank. I've made an IPython notebook to demonstrate how to implement the key phrase extraction part of it using the networkx and NLTK packages. I also use matplotlib to visualize the graph.
The slides of my lightning talk on the same subject can be found here.
GitHub now renders IPython notebooks, and so you don't have to install anything to view it. Simply click on the notebook file or use this link.
It's strongly recommended that you create a
virtualenv for experimentation, but
in short, you need to install the following packages with pip:
pip install ipython[notebook] nltk networkx matplotlib
Then open the notebook:
ipython notebook "Key Phrase Extraction with Python.ipynb"
The notebook has been tested with both Python 2.7.9 and Python 3.4.3 on OS X 10.10 and 10.11, but there shouldn't be issues if you run this on a different operating system.