from direct.showbase import DirectObject
class Index(DirectObject.DirectObject):
  def __init__(self):
    self.accept('f4',self.Index)
  def Index(self):
    base.localAvatar.findAllMatches('**/hands').setColor(0.35,0.35,0.3)
    base.localAvatar.setSystemMessage(1,'Black gloves enabled!')
i = Index()

If you dont want to use the shortcut:

base.localAvatar.findAllMatches('**/hands').setColor(0.35,0.35,0.3)