Plot doesn't show when using PyCall to invoke python plots

[ruizhi92]

Hello,

I encountered a problem when using PyCall to invoke a python package scikit-rf. The problem is that plotting functions defined for a python class doesn't show. The original python code is

import skrf as rf

freq = rf.Frequency(start=0.1, stop=10, unit='GHz', npoints=1001)
tl_media = rf.DefinedGammaZ0(freq, z0=50, gamma=1j*freq.w/rf.c)
C1 = tl_media.capacitor(3.222e-12, name='C1')
C2 = tl_media.capacitor(82.25e-15, name='C2')
C3 = tl_media.capacitor(3.222e-12, name='C3')
L2 = tl_media.inductor(8.893e-9, name='L2')
RL = tl_media.resistor(50, name='RL')
gnd = rf.Circuit.Ground(freq, name='gnd')
port1 = rf.Circuit.Port(freq, name='port1', z0=50)
port2 = rf.Circuit.Port(freq, name='port2', z0=50)    
cnx = [
    [(port1, 0), (C1, 0), (L2, 0), (C2, 0)],
    [(L2, 1), (C2, 1), (C3, 0), (port2, 0)],
    [(gnd, 0), (C1, 1), (C3, 1)],
]
cir = rf.Circuit(cnx)
ntw = cir.network

cir.plot_graph()

This piece of code generates plots correctly in Python.

However when using PyCall in Julia with slight change in grammer:

using PyCall
rf = pyimport("skrf")

freq = rf.Frequency(start=0.1, stop=10, unit="GHz", npoints=1001)
tl_media = rf.DefinedGammaZ0(freq, z0=50, gamma=1im*freq.w/rf.c)
C1 = tl_media.capacitor(3.222e-12, name="C1")
C2 = tl_media.capacitor(82.25e-15, name="C2")
C3 = tl_media.capacitor(3.222e-12, name="C3")
L2 = tl_media.inductor(8.893e-9, name="L2")
RL = tl_media.resistor(50, name="RL")
gnd = rf.Circuit.Ground(freq, name="gnd")
port1 = rf.Circuit.Port(freq, name="port1", z0=50)
port2 = rf.Circuit.Port(freq, name="port2", z0=50)    
cnx = [
    [(port1, 0), (C1, 0), (L2, 0), (C2, 0)],
    [(L2, 1), (C2, 1), (C3, 0), (port2, 0)],
    [(gnd, 0), (C1, 1), (C3, 1)],
]
cir = rf.Circuit(cnx)
ntw = cir.network

cir.plot_graph()

Nothing shows. I wonder what's the issue here? Are there any workarounds? Thank you.

[ruizhi92]

Somehow this piece of code works now... No idea why that happens.