match cpython

[FoamyGuy]

Resolves: #28

@ladyada

Note this is a potentially breaking change, the behavior has been modified to return floats between 0.0 and 1.0 instead of ints between 0-255.

I searched in the library bundle and the learn guide repo and found no usages of this library. The closest things are examples that are meant to run on raspberry pi and thus have access to the CPython implementation.

We can bump the major release number if this gets merged.

[FoamyGuy]

I tested this against the cpython version with this script:

import colorsys
import cp_colorsys

for first in range(10):
    for second in range(10):
        for third in range(10):
            #print(colorsys.hsv_to_rgb(first / 10, second / 10, third / 10))
            #print(cp_colorsys.hsv_to_rgb(first / 10, second / 10, third / 10))
            assert (colorsys.hsv_to_rgb(first / 10, second / 10, third / 10) ==
                    cp_colorsys.hsv_to_rgb(first / 10, second / 10, third / 10))

            #print(colorsys.hls_to_rgb(first / 10, second / 10, third / 10))
            #print(cp_colorsys.hls_to_rgb(first / 10, second / 10, third / 10))
            assert (colorsys.hls_to_rgb(first / 10, second / 10, third / 10) ==
                    cp_colorsys.hls_to_rgb(first / 10, second / 10, third / 10))

In order to test I had to rename this library one to cp_colorsys.py, I'm not sure if it's possible or how to work around the name collision to test under CPython without renaming it.