Sandbox::https://github.com/rabnic/practical-python/blob/master/Work/mortgage.py

Repository navigation

# mortgage.py

# Exercise 1.7

principal = 500000.0

rate = 0.05

payment = 2684.11

total_paid = 0.0

month = 0

# If wish to speed up payments by paying extra

extra_payment_start_month = 60

extra_payment_end_month = 108

extra_payment = 1000.0

while principal > 0:

# Pay extra if month is in extra payments period

if extra_payment_start_month <= month <= extra_payment_end_month:

principal = principal * (1 + rate / 12) - (payment + extra_payment)

if not principal > 0:

break

total_paid += payment + extra_payment

else:

principal = principal * (1 + rate / 12) - payment

if not principal > 0:

break

total_paid += payment

month += 1

month_str = str(month)

total_paid_str = str(round(total_paid, 2))

principal_str = str(round(principal, 2))

# Format output to be in fixed tabular form

print(f"{month_str :5s} {total_paid_str:12s} {principal_str:10s}")

print(f"{'Total paid':10s} :{round(total_paid, 2)}")

print(f"{'Months':10s} :{month}")