def main():
print('========== Exersize 2.1.5 ==========\n')
print('Testing static method for monthly rate : {}'.format(
Loan.monthlyRate(.025)))
print('Testing testing static method for annual rate: {}'.format(
Loan.annualRate(.01)))
"""
The benefit of the static method is that neither the class nor the instance is passed in. This allows us
to include functions that may be useful for the class, but do not directly rely on information in the class.
From an organizational standpoint this makes it easier to organize the code. For example, the rate conversion is
not logically part of a loan object, however the loan class is where it makes most sense to include it.
"""
myLoan = Loan(360, .025, 100000)
print("Monthly Payment: {}".format(myLoan.monthlyPayment()))
print("Balance after 60 periods: {}".format(myLoan.balance(60)))
print("Interest due on period 60: {}".format(myLoan.interestDue(60)))
print("Principal due on period 60: {}".format(myLoan.principlaDue(60)))
print("The total payment should equal interest plus principal which is {}".
format(myLoan.interestDue(5) + myLoan.principlaDue(5)))
print("Total Interest paid is {}".format(myLoan.totalInterest()))
print("Total Payment is {}".format(myLoan.totalPayments()))
print("Total Interest paid is {}".format(myLoan.totalInterest()))
print("Old rate {}".format(myLoan.rate))
print("Old term {}".format(myLoan.term))
print("Old face {}".format(myLoan.face))
myLoan.rate = .035
myLoan.term = 60
myLoan.face = 20000
print("New rate {}".format(myLoan.rate))
print("New term {}".format(myLoan.term))
print("New face {}".format(myLoan.face))
