factorial of negative one (-1)

[Bj Raz]

I am working with differential equations of the higher roots of negative
one. (dividing enormous numbers into other enormous numbers to come out with
very reasonable numbers).
I am mixing this in to a script for Maya (the final output is graph-able as
a spiral.)
I have heard that Sage <http://www.sagemath.org/>, would be a good program
to do this in, but I'd like to try and get this to work in native python if
I can.

The script I am trying to port to Python is; http://pastebin.com/sc1jW1n4.
Since Python can't call functions, I would like to know if there is a work
around.

Thank you
Also; I would also like to know if there is a good way to go about building
Sage for msys.
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