Parameters aren't seen inside function

[deanhystad]

I was thinking something like this:

freq = 60
v = expr(sin(2*pi*freq*t))
cct = Circuit(
... Vin 1 0 v
... Rin 1 2 50
... Cs  2 4 1e-12
... L   2 3 0.32e-6
... Rs  3 4 5
... Cl  4 0 3e-12''')

And if you want to use math.pi, use it as math.pi. I think "from math import pi" hides the "pi" symbol.