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Convert a number to its closest fraction (See related posts)

Sometimes, I need to find a ratio approximation of a number.
Like 640 / 480 (vga) or similar number. I learn about farey
series a few years ago (1994).
The idea is actually quite simple.
>>> farey(math.pi,100)
(22, 7)

Get the implementation here.
to python conversion fraction ratio by korakot on Sun Sep 18 11:08:27 -0400 2005

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