Is Python only necessary to build some examples in the docs? How difficult is to make those examples generate some comment explaining that Python is not available?
Another possibility is that the examples save the results of the Python code to a .txt file that is committed to the repository along the docs, and is used in case Python is not available. Racket has a few of these pregenerated files, mostly to break cycles where the compiler would need a working copy of racket to bootstrap.