A Sample Color Picker by Python

color_picker.py

#!/usr/bin/python
import gtk, sys
def tohex(c):
   #Convert to hex string
   #little hack to fix bug
   s = ['#',hex(int(c[0]*256))[2:].zfill(2),hex(int(c[1]*256))[2:].zfill(2),hex(int(c[2]*256))[2:].zfill(2)]
   for item in enumerate(s):
      if item[1]=='100':
         s[item[0]]='ff'
   print s
   return ''.join(s)
csd = gtk.ColorSelectionDialog('Gnome Color Chooser')
cs = csd.colorsel
cs.set_has_opacity_control(True)
cs.set_current_alpha(65536)
if csd.run()!=gtk.RESPONSE_OK:
   print 'No color selected.'
   sys.exit()
c = cs.get_current_color()
print "Color Values:"
print 'red:',c.red
print 'green:',c.green
print 'blue:',c.blue
print 'alpha:',cs.get_current_alpha()
print "Hex Codes:"
print tohex((c.red/65536.0, c.green/65536.0, c.blue/65536.0))

If you look here, you can see one for each os:

https://github.com/weslly/ColorPicker/tree/master/lib