Re: How to set variable number of inputs/outputs in Python OOT modules

[George Edwards]

Hi Jeff,

Thanks for your response!

If you can write a short code snippet to show me how to do this I would appreciate it very much. For instance, I am making an OOT Python Interpolator block which takes a number of inputs and I would like to be able to set a parameter value to tell the block how many input ports are needed. Currently, my design is static, in that if I want to run an experiment with 4- complex input ports, then in a static manner, I set:

     in_sig = [numpy.complex64,  numpy.complex64,  numpy.complex64,  numpy.complex64]

The question is: how do I set "in_sig" in a non-static manner, so even if I wanted 4 inputs, I would not need to explicitly write it out as above and of course if I wanted 20 inputs, I just set a parameter to 20 and the grc block will show 20 inputs for signal connection?

The followup question to this is, how do I set up the "yml" file accordingly?

Thanks again for your help.

Regards,

George

On Wed, Feb 3, 2021 at 2:57 PM Jeff Long <willcode4@gmail.com> wrote:

`gr.io_signature()` in Python works exactly the same as it does in C++. The legacy Python way (list of types) is still used in most places, but you have the option.

On Wed, Feb 3, 2021 at 3:17 PM George Edwards <gedwards.eng@gmail.com> wrote:

Hello,

I wish to build an OOT module in Python which can take a variable number of inputs and outputs. In C++ OOT, there are the io signatures <+min_in+>,  <+max_in+>, etc. which can be set to 1 and -1 to mean the input can be any number. Python does not have these, it has the in_sig and out_sig which do not offer the flexibility as the C++ OOT. How can I get a variable number of inputs/outputs that is user defined in a Python OOT?

Also, how do I set the parameters in yml file for variable inputs and outputs?

I will appreciate any help.

Thank you!

Regards,

George