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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def default_antenna2(self, context):
 """ Default antenna2 values """

    ant1, ant2 = default_base_ant_pairs(self, context)
    (tl, tu), (bl, bu) = context.dim_extents('ntime', 'nbl')
    ant2_result = np.empty(context.shape, context.dtype)
    ant2_result[:,:] = ant2[np.newaxis,bl:bu]
    return ant2_result