?????? the out_items of python block?

[????????]

Hi Marcus,
Do you mean that I only performed assignment operations on out_items[0][1] to 
out_items[0][9], and I did not perform any operations on other out_items[0][i], 
and then reported to GNURadio? ?
I observed the performance of "QT GUI Time sink", which is a graph resembling a 
rectangular signal, which seems understandable because I assigned a value of 
0.5 to out_items[0][1] to out_items[0][9]. As time goes by, the rectangular 
signal moves to the right. If you look more closely, the width of the 
rectangular signal has actually changed! I really don't understand.
Please forgive me for being stupid, but hope someone can help me explain it in 
detail.

Sincerely
Liu Maolin





------------------ ???????? ------------------
??????:                                                                         
                                               "Marcus M??ller"                 
                                                                   
<mmuel...@gnuradio.org&gt;;
????????:&nbsp;2021??6??23??(??????) ????8:26
??????:&nbsp;"discuss-gnuradio"<discuss-gnuradio@gnu.org&gt;;

????:&nbsp;Re: the out_items of python block?



Hi liumaolin,

&gt; &nbsp; &nbsp; def work(self, input_items, output_items):
&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; """example: multiply with constant"""
&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; for i in range(10) :

You can't do that: you need to make sure you've got at least 10 output items to 
fill!

&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; return len(output_items[0])

Here you tell GNU Radio that you produced `len(output_items[0])` items, where 
in reality
you produced 10, which might (and will) be less or more than 
`len(output_items[0])`!

Best regards,
Marcus