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Okay, finally have most of an answer.

1. Install Humor-Sans.ttf in ~/.fonts (You may have to rename it).

2. Under Linux, the .matplotlib directory lives in ~/.sage. cd into it and remove the fontList.cache

3. Currently, use of constant-value tick_formatters such as pi, e, sqrt(2) will default back to using the normal font - this is unlikely to have a quick solution as the Humor Sans font is missing several mathematical symbols any way.