[Discuss-gnuradio] How to access gnu vector from external source

[zianggaowireless]

Hello,
    I'm writing a block in Python that doing signal recognition from input fft 
vector and output a vector contains the spectrum information, now I want to 
parse the vector from gnuradio to an external python script doing further 
decisions, is there any method to access the vector? I tried creating message 
queue but really don't understand how that work.
   Thanks.
Best regards,
Ziang.

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