BS期权定价

def solve(____):
    import math
    from math import erf
    N = lambda x: ____ * (____ + erf(x / math.sqrt(____)))
    d1 = (math.log(____) + (____) * T) / (sigma * math.sqrt(____))
    d2 = d1 - sigma * math.sqrt(____)
    if option_type == "____":
        price = S * N(____) - K * math.exp(____) * N(____)
    else:
        price = K * math.exp(____) * N(____) - S * N(____)
    return {"____": option_type, "____": round(____)}