def METHOD_NAME(kv_str):
    """Sets a single numpy printoption from a string of the form 'x=y'.
    See documentation on numpy.set_printoptions() for details about what values
    x and y can take. x can be any option listed there other than 'formatter'.
    Args:
      kv_str: A string of the form 'x=y', such as 'threshold=100000'
    Raises:
      argparse.ArgumentTypeError: If the string couldn't be used to set any
          nump printoption.
    """
    k_v_str = kv_str.split("=", 1)
    if len(k_v_str) != 2 or not k_v_str[0]:
        raise argparse.ArgumentTypeError("'%s' is not in the form k=v." % kv_str)
    k, v_str = k_v_str
    printoptions = numpy.get_printoptions()
    if k not in printoptions:
        raise argparse.ArgumentTypeError("'%s' is not a valid printoption." % k)
    v_type = type(printoptions[k])
    if printoptions[k] is None:
        raise argparse.ArgumentTypeError("Setting '%s' from the command line is not supported." % k)
    try:
        v = v_type(v_str) if v_type is not bool else flags.BooleanParser().parse(v_str)
    except ValueError as e:
        raise argparse.ArgumentTypeError(str(e))
    numpy.set_printoptions(**{k: v})