[Discuss-gnuradio] Vectors in embedded python blocks

[Marcus D. Leech]

There doesn't appear to be a way to express the kinds of variable-length 
vectors that you can use with other blocks (NOT, I emphasize,
  *RUNTIME VARIABLE*).  You basically have to wire-in the vector sizes 
in the code, rather than taking them as parameters, the way other blocks
  can (basically, all blocks that take a vector I/O can allow that to 
be specified, although not at run-time).

Is there a "trick" with embedded blocks to make this work?