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update to python 3.x #12

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13 changes: 6 additions & 7 deletions B03898_05_Codes/bond_ytm.py
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Expand Up @@ -2,26 +2,25 @@
README
======
This file contains Python codes.
Python 3.x
======
"""

""" Get yield-to-maturity of a bond """
import scipy.optimize as optimize


def bond_ytm(price, par, T, coup, freq=2, guess=0.05):
def bond_ytm(price, par, maturity, coup, freq=2, guess=0.05):
freq = float(freq)
periods = T*freq
coupon = coup/100.*par/freq
periods = maturity*freq
coupon = coup*par/freq
dt = [(i+1)/freq for i in range(int(periods))]
ytm_func = lambda(y): \
sum([coupon/(1+y/freq)**(freq*t) for t in dt]) + \
par/(1+y/freq)**(freq*t) - price
ytm_func = lambda y: sum([coupon/(1+y/freq)**(freq*t) for t in dt]) + par/(1+y/freq)**(freq*maturity) - price

return optimize.newton(ytm_func, guess)

if __name__ == "__main__":
ytm = bond_ytm(95.0428, 100, 1.5, 5.75, 2)
print ytm
print (ytm)