One neuron with noise

import nest
import nest.voltage_trace

nest.ResetKernel()

neuron = nest.Create("iaf_psc_alpha")

noise = nest.Create("poisson_generator", 2)
nest.SetStatus(noise, [{"rate": 80000.0}, {"rate": 15000.0}])

voltmeter = nest.Create("voltmeter")
nest.SetStatus(voltmeter, {"withgid": True, "withtime": True})

nest.Connect(noise, neuron, syn_spec={'weight': [[1.2, -1.0]], 'delay': 1.0})
nest.Connect(voltmeter, neuron)

nest.Simulate(1000.0)

nest.voltage_trace.from_device(voltmeter)