File "/usr/lib/python3.7/site-packages/pyvisa/resources/messagebased.py", line 690, in assert_trigger
constants.VI_TRIG_PROT_DEFAULT)
File "/usr/lib/python3.7/site-packages/pyvisa-py/highlevel.py", line 241, in assert_trigger
return self.sessions[session].trigger(protocol)
AttributeError: 'GPIBSession' object has no attribute 'trigger'
https://github.com/pyvisa/pyvisa-py/pull/180 fixes it