การพล็อตกราฟ duration เทียบกับปัจจัยต่าง ๆ

# Create array of coupon rates and assign to pandas DataFrame
bond_coupon = np.arange(____, ____, ____)
bond = pd.DataFrame(____, columns=['____'])

# Calculate bond price, price_up, price_down, and duration
bond['price'] = -npf.pv(rate=0.05, nper=10, pmt=bond['bond_coupon'], fv=100)
bond['price_up'] = ____
bond['price_down'] = ____
bond['duration'] = (bond['____'] - bond['____']) / (2 * bond['____'] * 0.01)

# Plot coupon vs. duration, add labels & title, show plot
plt.plot(____, ____)
plt.xlabel('Coupon (%)')
plt.ylabel('Duration (%)')
plt.show()