Exercise 1.3 - Solution
(a) Dave’s Mortgage
principal = 500000.00
rate = 0.04
payment = 499.00
months = 0
total_paid = 0.00
while principal > 0:
principal = principal*(1+rate/12) - payment
total_paid += payment
months += 1
if months == 24:
payment = 3999.00
rate = 0.09
print "Total months", months
print "Total paid", total_paid
(b) Make a table
principal = 500000.00
rate = 0.04
payment = 499.00
months = 0
total_paid = 0.00
while principal > 0:
principal = principal*(1+rate/12) - payment
total_paid += payment
months += 1
if months == 24:
payment = 3999.00
rate = 0.09
print months, total_paid, principal
print "Total months", months
print "Total paid", total_paid
Commentary:
After your program has finished executing, notice how all of the variables defined in your program are still alive in the interpreter. For instance, you can calculate the number of years by typing this statement:
>>> months/12.0
56.416666666666664
>>>
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