diff --git a/B03898_05_Codes/bond_ytm.py b/B03898_05_Codes/bond_ytm.py
index 9f17aaf..63fde34 100644
--- a/B03898_05_Codes/bond_ytm.py
+++ b/B03898_05_Codes/bond_ytm.py
@@ -2,6 +2,7 @@
 README
 ======
 This file contains Python codes.
+Python 3.x
 ======
 """
 
@@ -9,19 +10,17 @@
 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)