Finance: Black Scholes Model not working

[pwt]

Hi,

I'm trying to learn Python and is only my second day learning the code. At the moment, I'm trying to use the Mibian library to do some simple options pricing.

I've written this simple code to do some calculations:

import mibian

def BSModel():
    c = mibian.BS([40.75, 32, 1, 127, 30], putPrice=0.95)
    print("Implied vol is ",c.impliedVolatility)
    print("Delta is ",c.putDelta)
    print("Theta is ",c.putTheta)
    print("Vega is ",c.vega)
    print("Gamma is ",c.gamma)

The results from the above are as below:

Output:
BSModel()
Implied vol is  45.654296875
Delta is  None
Theta is  None
Vega is  None
Gamma is  None

Strangely, it's only showing the calculation for the implied volatility but the rest is returning none. I've tried changing the input data but it's doing the same.

I feel like I'm made some newbie error somewhere. Appreciate any feedback. Thanks.