def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def loopcv():
  import cv
  while 1:
    cv.ShowImage('hi',get_depth().astype(np.uint8))
    cv.WaitKey(10)