Command line utility for building punchcard graphs
Installing with pip pip install punchcard.py
Installing from source python setup.py install
Also requires installing pygooglechart
punchard.py is friendly. Ask it for usage information with --help
Accepts a stream of timestamps and creates a punchcard graph
For more info (and links to two scripts that generate streams of timestamps from either a WordPress archive or a Twitter archive), check out http://aaron.jorb.in/blog/2013/03/introducing-punchcard-py/