Determine size of a sample from gnuradio src object in python

Question

Say I have a gnuradio src object in python, e.g.,:

src = analog.sig_source_c(sim_sam_rate, analog.GR_SIN_WAVE, sine_prms['frq_in_hz'],
                                  sine_prms['mag'], sine_prms['offset'])

or

src = blocks.vector_source_f(sine_sam)

How can I determine from src the size of a single source sample? In the first example, it would be gr.sizeof_gr_complex (or 8) and in the second example gr.sizeof_float (or 4) since sine_sam are samples of a real sinewave.

The context is that I'm trying to use gnuradio without companion. I'd like to create a throttle, which requires knowledge of the size of the samples. I would like to obtain that information from the src object itself.

Answer 1

src.output_signature().sizeof_steam_items() 

gives a tuple containing the sizes of each output.