[Discuss-gnuradio] Read/Write stream tags in Python

Hello all,  I've been trying to work with stream tags in python, mainly using the  grextras blocks coding guide here:  https://github.com/guruofquality/grextras/wiki/Blo....    I've set up a very simple flow graph, just a vector source, throttle and  file sink, and I would like to place a tag on the first element of the  vector that contains time metadata. I'm using this code:    def work(self, input_items, output_items):  item_index = ? #which output item gets the tag?  offset = self.nitems_written(0) + item_index  key = pmt.pmt_string_to_symbol("example_key")  value = pmt.pmt_string_to_symbol("example_value")    #write at tag to output port 0 with given absolute item offset  self.add_item_tag(0, offset, key, value)    I think the problem has something to do with not implementing the  correct modules. My question is, what are the appropriate modules to  import to read and write stream tags in python?

Thank You,

-Anisha