Does graphical display of an HfstTransducer in a jupyter notebook work somehow in the current version of hfst? It does work as follows with hfst_dev and Python 3.7.

import hfst_dev as hfst
import graphviz
hfst.version
'3.15.0.10'
from platform import python_version
python_version()
'3.7.16'

r1 = hfst.regex('a:b')
type(r1)
libhfst_dev.HfstTransducer
r1.view()
A transducer is displayed graphically inline in the notebook with graphviz.

In a current hfst HfstTransducer.view method seems not to be defined, and I did not find an alternative.