from brian import *

tau = 10 * ms
bof = 3.0

eqs = Equations('''
dx/dt = -x/tau : 1
V = x*bof : 1
''')

G = NeuronGroup(1, eqs)
G2 = NeuronGroup(1, eqs)

G.x = 1
G2.x = 2

print G.V
print G2.V