Unfortunately there is no proper tool in python to visualize set operations and relations, neither in maplotlib nor in graphviz. The closest solution that I found was a Venn diagram library attaached to maplotlib.
The latest version can be downloaded here. There also sample examples can be found. These however don't work with a browser after some tiny changes I got it running in my web environment too.
The first example shows a fully customized diagram:
[Error: Macro 'mathplot' error: mathplot() got an unexpected keyword argument 'title']
The second example demonstrates subplots:
[Error: Macro 'mathplot' error: mathplot() got an unexpected keyword argument 'title']
Overlapping between the three sets is demonstrated in this last example:
[Error: Macro 'mathplot' error: mathplot() got an unexpected keyword argument 'title']
My intention was to use these diagrams to visualize set operations and set relations, such as
[Error: Macro 'me' doesn't exist]
[Error: Macro 'mathplot' error: mathplot() got an unexpected keyword argument 'title']
Basic set operations are shown on a separate page.
Unfortunately the implementation of Venn diagram is merely basic, for instance such complex operations cannot be visualized.
[Error: Macro 'me' doesn't exist]
and
[Error: Macro 'me' doesn't exist]
