GNU Radio embedded python block: basic block

[lannan jiang]

Hi everyone, 
  I want to use the embedded python block to do this: 
        - I have some source data bytes, and now I want to transmit a sequence 
of bytes before the data. 
        - I am thinking that the basic block is what I can use to achieve this.

However, I looked up other people’s questions regarding basic blocks in the 
archive, i wonder if there are better examples that include forecast() and 
general_work() functions that I could look at?

Any suggestions will be appreciated! 

Thank you 

Sincerely,
Lannan Jiang

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