def principalDueRecur(self, period): #this method no rate is involved
t = Timer('Principal Due Recur Timer')
t.start()
if period > self.term:
logging.info('Period is greater than the term.')
return None
logging.debug('The principal due for {} is {}.'.format(
period,
self.monthlyPayment(period) - self.interestDueRecur(period)))
t.end()
if t.retrieve(0) > t.getWarnThreshold():
logging.warning(
'The running time is over {} for {} and it is driving out your computer resource.'
.format(t.getWarnThreshold(), t._timerName))
return self.monthlyPayment(period) - self.interestDueRecur(period)
def equity(self, period):
t = Timer('Equity Recur Timer')
t.start()
if period > self.term:
logging.info('Period is greater than the term.')
return None
logging.debug('The equity for {} is {}.'.format(
period,
self._asset.getPresValue(period) - self.balanceRecur(period)))
t.end()
if t.retrieve(0) > t.getWarnThreshold():
logging.warning(
'The running time is over {} for {} and it is driving out your computer resource.'
.format(t.getWarnThreshold(), t._timerName))
return self._asset.getPresValue(period) - self.balanceRecur(period)
def interestDueRecur(self, period):
t = Timer('Interest Due Recur Timer')
t.start()
if period > self.term:
logging.info('Period is greater than the term.')
return None
logging.debug('The interest due for {} is {}.'.format(
period,
self.balanceRecur(period - 1) * self.rate(period)))
t.end()
if t.retrieve(0) > t.getWarnThreshold():
logging.warning(
'The running time is over {} for {} and it is driving out your computer resource.'
.format(t.getWarnThreshold(), t._timerName))
return self.balanceRecur(period - 1) * self.rate(period)
def myDemo():
home = PrimaryHome(1000000)
dummy = FixedMortgage(None, 1000000, .05, 12)
# should logging
loan = FixedMortgage(home, 1000000, .05, 12)
loan.balanceRecur(13)
# should logging
loan.balanceRecur(3)
# should logging
with Timer('my timer') as t:
ntime.sleep(61)
def balanceRecur(self, period): #this method no rate is involved
t = Timer('Balance Recur Timer')
t.start()
if period > self.term:
logging.info('Period is greater than the term.')
return None
if period == 0:
logging.debug('The balance for {} is {}.'.format(
period, self.face))
return self.face
else:
logging.debug('The balance for {} is {}.'.format(
period,
self.balanceRecur(period - 1) -
self.principalDueRecur(period)))
t.end()
if t.retrieve(0) > t.getWarnThreshold():
logging.warning(
'The running time is over {} for {} and it is driving out your computer resource.'
.format(t.getWarnThreshold(), t._timerName))
return self.balanceRecur(period -
1) - self.principalDueRecur(period)
def main():
# Exercise 3.4.1
print(
'\n====================================Exercise 3.4.1=====================================\n'
)
print('Running context manager demo ... \n')
with open('randomfile.txt', 'w') as f:
f.write('This is a demo file. \n')
f.write('This is the second line. \n')
f.write('This is the ending line. \n')
if f.closed:
logging.info('File is closed. \n')
raw_input('Program pause. Press enter to continue.\n')
# Exercise 3.4.2
print(
'\n====================================Exercise 3.4.2=====================================\n'
)
print('Running context manager with Timer class ... \n')
with Timer('myTimer') as timer:
#time.sleep(10);
timer.configureTimerDisplay('hrs', 'mins')
raw_input('Demo finished successfully. Press any key to exit.\n')
def main():
# Exercise 2.1.2
# Create a loan for the whole demo with face=1000000, APR=.035 and term=360 months
loan = Loan(None, face=1000000, rate=0.035, term=360)
# a) Use a method to compute monthly payment
print(
'\n====================================Exercise 2.1.2=====================================\n'
)
print('Step a: Running my monthlyPayment method ... \n')
pmt = round(loan.monthlyPayment(period=24), 2)
#period is a dummy variable
print('The monthly payment is {}. \n'.format(pmt))
raw_input('Program pause. Press enter to continue.\n')
# b) Use a method to compute total payment
print('Step b: Running my totalPayments method ... \n')
pmtTtl = round(loan.totalPayments(period=24), 2)
print('The total payment is {}. \n'.format(pmtTtl))
raw_input('Program pause. Press enter to continue.\n')
# c) Use a method to compute total interest
print('Step c: Running my totalInterest method ... \n')
instTtl = round(loan.totalInterest(), 2)
print('The total interest is {}. \n'.format(instTtl))
raw_input('Program pause. Press enter to continue.\n')
# Exercise 2.1.3
print(
'\n====================================Exercise 2.1.3=====================================\n'
)
# Create three timers for interest due, principal due and balance computation respectively
t_inst = Timer()
t_prin = Timer()
t_bala = Timer()
print('Part 1: Running my formulas evaluation approach ... \n')
print('Step a: Running my interestDueFoml method ... ')
t_inst.start()
instDue = loan.interestDueFoml(period=24)
t_inst.end()
print('The interest due for period {} is {}. '.format(
24, round(instDue, 2)))
print('Step b: Running my principalDueFoml method ... ')
t_prin.start()
principalDue = loan.principalDueFoml(period=24)
t_prin.end()
print('The principal due for period {} is {}. '.format(
24, round(principalDue, 2)))
print('Step c: Running my balanceFoml method ... ')
t_bala.start()
balance = loan.balanceFoml(period=24)
t_bala.end()
print('The balance for period {} is {}. \n'.format(24, round(balance, 2)))
raw_input('Program pause. Press enter to continue.\n')
print('Part 2: Running my recursive approach ... \n')
print('Step a: Running my interestDueRecur method ... ')
t_inst.start()
instDue = loan.interestDueRecur(period=24)
t_inst.end()
print('The interest due for period {} is {}. '.format(24, round(instDue)))
print('Step b: Running my principalDueRecur method ... ')
t_prin.start()
principalDue = loan.principalDueRecur(period=24)
t_prin.end()
print('The principal due for period {} is {}. '.format(
24, round(principalDue)))
print('Step c: Running my balanceRecur method ... ')
t_bala.start()
balance = loan.balanceRecur(period=24)
t_bala.end()
print('The balance for period {} is {}. \n'.format(24, round(balance)))
raw_input('Program pause. Press enter to continue.\n')
print(
'Part 3: Comparing two costs of approachs to Implementations of method balance ... \n'
)
t_1 = Timer()
t_2 = Timer()
for perid in range(360 + 1):
t_1.start()
balance = loan.balanceFoml(period=perid)
t_1.end()
t_2.start()
balance = loan.balanceRecur(period=perid)
t_2.end()
raw_input('Program pause. Press enter to continue.\n')
print('Part 4: Comparing two costs of approachs ... \n')
print('Costs of formula approach are {}, {}, {} respectively. ' \
.format(t_inst.retrieve(1), t_prin.retrieve(1), t_bala.retrieve(1)))
print('Costs of recursive approach are {}, {}, {} respectively. ' \
.format(t_inst.retrieve(0), t_prin.retrieve(0), t_bala.retrieve(0)))
print(
'As period increases, the cost of recursive method increases rapidly')
raw_input('Program pause. Press enter to continue.\n')
# Exercise 2.1.4
print(
'\n====================================Exercise 2.1.4=====================================\n'
)
# a) Implement a class-level method called calcMonthlyPmt, in the Loan base class. This should calculate a monthly
# payment based on three parameters: face, rate, and term
print('Step a: Running my calcMonthlyPmt class method ... \n')
pmt = Loan.calcMonthlyPmt(face=1000000, rate=0.035, term=360)
print('The monthly payment is {}. \n'.format(round(pmt, 2)))
raw_input('Program pause. Press enter to continue.\n')
# b) Create a class-level function, in the Loan base class, which calculates the balance (calcBalance). Input
# parameters should be face, rate, term, period
print('Step b: Running my calcBalance class method ... \n')
balance = Loan.calcBalance(face=1000000, rate=0.035, term=360, period=24)
print('The balance is {}. \n'.format(round(balance, 2)))
raw_input('Program pause. Press enter to continue.\n')
# c) Test the class-level methods in main
print('Step c: Test the class-level methods in main. \n')
print('This part is shown in step (a) and (b). \n')
raw_input('Program pause. Press enter to continue.\n')
# d) Modify the object-level methods for monthlyPayment and balance to delegate to the class-level methods
# e) Test the object-level methods to ensure they still work correctly.
print(
'Step d and e: Running my monthlyPayment2 object-level method ... \n')
pmt = Loan.monthlyPayment2(loan, period=24)
print('The monthly payment is {}. \n'.format(round(pmt, 2)))
raw_input('Program pause. Press enter to continue.\n')
# f) What are the benefits of class-level methods? When are they useful?
print('Step f: The benefits of class-level methods. \n')
print(
'The class methods can be called on the class itself and does not know about any object istance. \
It applied to all past, present and future objects of the class. ')
print(
'Useful for methods that are related to the class but not logically meant to perform on a \
instantiated object. ')
raw_input('The demo successfully finished. Press press any key to exit.\n')
# Exercise 2.1.5
# Write comments
print(
'\n====================================Exercise 2.1.5=====================================\n'
)
# a) Create a static-level method in Loan called monthlyRate. This should return the monthly interest
# rate for a passed-in annual rate
print('Step a: Running my monthlyRate static method ... \n')
monthlyRate()
raw_input('Program pause. Press enter to continue.\n')
# b) Create another static-level method that does the opposite (returns an annual rate for a passed-in monthly rate)
print('Step b: Running my annualRate static method ... \n')
annualRate()
raw_input('Program pause. Press enter to continue.\n')
# c) Test the static-level method in main.
print('Step c: Test the static-level methods in main. \n')
print('This part is shown in step (a) and (b). \n')
raw_input('Program pause. Press enter to continue.\n')
# d) Modify all the Loan methods that rely on the rate to utilize the static-level rate functions
# Create a new class Loan2 to modify all the Loan2 methdos that rely on rate with help of static rate functions
loan2 = Loan2(None, 1000000, 0.035, 360)
print('The monthly payment is ' + str(loan2.monthlyPayment(period=24)) +
'\n')
print('The total payment is ' + str(loan2.totalPayments(period=24)) + '\n')
print('The total interest is ' + str(loan2.totalInterest()) + '\n')
print('The interest due for period 24 is ' +
str(loan2.interestDueFoml(period=24)) + '\n')
print('The principal due for period 24 is ' +
str(loan2.principalDueFoml(period=24)) + '\n')
print('The balance for period is ' + str(loan2.balanceFoml(period=24)) +
'\n')
print('The interest due for period 24 is ' +
str(loan2.interestDueRecur(period=24)) + '\n')
print('The principal due for period 24 is ' +
str(loan2.principalDueRecur(period=24)) + '\n')
print('The balance due for period 24 is ' +
str(loan2.balanceRecur(period=24)) + '\n')
# e) What are the benefits of static-level methods? When are they useful?
print('Step e: The benefits of static-level methods. \n')
print('The static-level methods will not aware of any object instantiate \
of over even the class itself.')
print(
'Useful for grouping related functions together which may not logically from a class. '
)
raw_input('The demo successfully finished. Press press any key to exit.\n')
def main():
# Exercise 2.1.1
print('\n====================================Exercise 2.1.1 (a)=====================================\n');
# a) Create a class called Timer
print('In step a: Creating a object t belongs to class Timer ... \n');
ta=Timer();
print('Type of new object t is '+str(type(ta))+'\n');
raw_input('Program pause. Press enter to continue.\n');
# b) Add a start method and end method
print('\n====================================Exercise 2.1.1 (b)=====================================\n');
print('In step b: Using start and end method ... \n');
ta.start();
for i in range(10000000): #some random functions that takes time to execute
i+=1;
ta.end();
raw_input('Program pause. Press enter to continue.\n');
# c) Note that start should give an error if the Timer is already started and end should give an error if the
# Timer is not currently running
print('\n====================================Exercise 2.1.1 (c)=====================================\n');
print('In step c: start and end will raise errors message if unappropriate call ... \n');
print('Case 1 demo: start is called after the timer is started. \n');
tc=Timer();
tc.start();
tc.start();
print('Case 2 demo: end is called before the timer is started. \n');
tc2=Timer();
tc2.end();
raw_input('Program pause. Press enter to continue.\n');
# d) Add the ability to configure the Timer to display either seconds, minutes, or hours
print('\n====================================Exercise 2.1.1 (d)=====================================\n');
print('In step d: Running my display function ... \n');
print('Displaying seconds only: \n');
td=ta;
td.display('seconds');
print('Displaying minites only: \n');
td.display('minutes');
print('Displaying hours only: \n');
td.display('hours');
print('Displaying seconds, minutes and hours: \n');
td.display('seconds','minutes','hours');
raw_input('Program pause. Press enter to continue.\n');
# e) Add a method to retrieve the last timer result
print('\n====================================Exercise 2.1.1 (e)=====================================\n');
te=Timer();
te.start();
for i in range(10000000):
i+=1;
te.end(); te.start();
for i in range(5000000):
i*=1;
te.end();
print('Running my retrieve function ... \n');
print('Retriving the current data: \n');
print(str(te.retrieve(0))+'\n');
print('Retriving the previous one data: \n');
print(str(te.retrieve(1))+'\n');
raw_input('Timer demo is successfully finished. Press any key to exit. \n');
def main():
# Exercise 4.1.5
# Add a start method and end method
print('\n====================================Exercise 4.1.5=====================================\n');
print('Step a: Using start and end method ... \n');
ta=Timer('Timer 1');
ta.start();
time.sleep(5);
ta.end();
raw_input('Program pause. Press enter to continue.\n');
# Showing the ability to configure the Timer to display either seconds, minutes, or hours
print('Step b: Running my display function ... \n');
print('Displaying seconds only: \n');
td=ta;
td.display('secs'); print('');
print('Displaying minites only: \n');
td.display('mins'); print('');
print('Displaying hours only: \n');
td.display('hrs'); print('');
print('Displaying seconds, minutes and hours: \n');
td.display('secs','mins','hrs'); print('');
raw_input('Program pause. Press enter to continue.\n');
# Method to retrieve the last timer result
print('Step c: Running my retrieve function ... \n');
te=Timer('Timer 2');
te.start();
time.sleep(20);
te.end(); te.start();
time.sleep(5);
te.end();
print('Running my retrieve function ... \n');
print('Retriving the current data: \n');
print(te.retrieve(0)); print('');
print('Retriving the previous one data: \n');
print(te.retrieve(1)); print('');
raw_input('Exercise 4.1.5 demo is successfully finished. Press any key to exit. \n');