software documentation system?

[Graham Guttocks]

Greetings,

A Python application of mine is now large enough that I need to get
more serious about writing a real manual for it.  I'm looking for a
documentation system that uses a single source file to produce both
online information and printed output. (PS, HTML, etc.)

Any recommendations?  I work in a UNIX environment and would prefer 
an opensource alternative.  So far I've found GNU texinfo and also
SGMLtools which is written in Python, but am open to other
suggestions.

Regards,
Graham

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