How to use constellation plot in python

Hello All
I was trying to implement in my python program a constellation plot. I
found this function called const_sink_c() [Hope its the right one, there
is
one called scope_sink too]. Can you please explain me how to use the
function.
I have derived following expression from constsink_gl.py like as
following
constsink_gl.const_sink_c(parent,
title=’’",
sample_rate=1,
size=const_window.DEFAULT_WIN_SIZE,
frame_rate=const_window.DEFAULT_FRAME_RATE,
const_size=const_window.DEFAULT_CONST_SIZE,
#mpsk recv params
M= depends on modulation 4 or 2,
theta=0,
loop_bw=6.28/100.0,
fmax=0.06,
mu=0.5,
gain_mu=0.005,
symbol_rate=1,
omega_limit=0.005)
Is it correct use? If not then how to use it?
Thanks for your time
Shashank G.

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