Code I wrote for a GUI representation of different color code conversions. e.g RGB to cmyk

File consists of a series of tests, GUI application and the following relevant functions:

str5_cymk: Returns: String representation of cmyk in the form "(C, M, Y, K)". In the output, each of C, M, Y, and K should be exactly 5 characters long. Hence the output of this function is not the same as str(cmyk) Example: if str(cmyk) is '(0.0,31.3725490196,31.3725490196,0.0)' then str5_cmyk(cmyk) is '(0.000, 31.37, 31.37, 0.000)'. Note the spaces
after the commas. These must be there. Parameter cmyk: the color to convert to a string Precondition: cmyk is an CMYK object.

str5_hsv: Returns: String representation of hsv in the form "(H, S, V)". In the output, each of H, S, and V should be exactly 5 characters long. Hence the output of this function is not the same as str(hsv) Example: if str(hsv) is '(0.0,0.313725490196,1.0)' then str5_hsv(hsv) is '(0.000, 0.314, 1.000)'. Note the spaces after the commas. These must be there. Parameter hsv: the color to convert to a string Precondition: hsv is an HSV object.

rgb_to_cymk: Returns: color rgb in space CMYK, with the most black possible. with the formulae from en.wikipedia.org/wiki/CMYK_color_model. Parameter rgb: the color to convert to a CMYK object Precondition: rgb is an RGB object.

cymk_to_rgb: Returns : color CMYK in space RGB With the formulae from en.wikipedia.org/wiki/CMYK_color_model. Parameter cmyk: the color to convert to a RGB object Precondition: cmyk is an CMYK object.

rgb_to_hsv: Return: color rgb in HSV color space Formulae from wikipedia.org/wiki/HSV_color_space. Parameter rgb: the color to convert to a HSV object Precondition: rgb is an RGB object.

hsv_to_rgb: Returns: color in RGB color space. With the formulae from http://en.wikipedia.org/wiki/HSV_color_space. Parameter hsv: the color to convert to a RGB object Precondition: hsv is an HSV object.