债券价格与利率关系

def solve(____):
    coupon = face_value * coupon_rate
    prices = []
    for ytm in ytm_range:
        price = sum(coupon / (____ + ytm) ** t for t in range(____, maturity + ____))
        price += face_value / (____ + ytm) ** maturity
        prices.append(round(____))
    return {"____": ytm_range, "____": prices}