债券定价基础

def solve(face_value, coupon_rate, ytm, maturity):
    coupon = face_value * coupon_rate
    price = sum(coupon / (1 + ytm) ** t for t in range(1, maturity + 1))
    price += face_value / (1 + ytm) ** maturity
    return {"面值": face_value, "票息率": coupon_rate, "YTM": ytm, "期限": maturity, "债券价格": round(price, 2)}