def METHOD_NAME(self):
    """get_bounds() -> tuple(min, max)
    Returns a tuple (min, max) of the bounding values for the data source.
    In the case of 2-D data, min and max are 2-D points that represent the
    bounding corners of a rectangle enclosing the data set.  Note that
    these values are not view-dependent, but represent intrinsic properties
    of the data source.
    If data is the empty set, then the min and max vals are 0.0.
    """
    raise NotImplementedError