[Discuss-gnuradio] How to specify vector input signature for gr_sync_block.

[Manu T S]

I am trying to write code for a block which accepts a vector input and spits out a vector output. The block is derived from gr_sync_block.
From the tutorial on OOT I have the following information. For a block with single input and single output the __init__ method is as given below.

def __init__(self):
    gr.sync_block.__init__(self,
             name = "square3_ff",
             in_sig = [numpy.float32],
             out_sig = [numpy.float32])

How do I take in a vector input?

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Manu T S