def equalsAmortization(pv, i, n):
""" This method will implement the amortization based on the constant amortization system for PRICE payment """
if i == None or pv == None or n == None or i == 0 or pv == 0 or n == 0:
raise PyFinancialLibraryException, "Some values for calculating amortization have not been provided."
realRate = i / Decimal('100.0')
#Getting constant amortization
amortization = convertToDecimal(pv) / n
#Storing information for first period, containing for each period: pmt, interest, acumulated interest, amortization, acumulated amortization and amount to be payed
amortizationPlan = AmortizationTable(n)
amortizationPlan.setTableLine(0, Decimal('0.0'), Decimal('0.0'),
Decimal('0.0'), Decimal('0.0'),
Decimal('0.0'), pv)
#Calculating information for other periods
for index in xrange(1, n + 1, 1):
lastLine = index - 1
lastAmountToBePayed = amortizationPlan.getNewAmountToBePayed(lastLine)
acumulatedAmortization = amortizationPlan.getNewAcumulatedAmortization(
lastLine)
acumulatedInterest = amortizationPlan.getNewAcumulatedInterest(
lastLine)
interest = (pv * realRate) - (amortization * realRate * (index - 1))
payment = amortization + interest
newAmountToBePayed = lastAmountToBePayed - amortization
newAcumulatedAmortization = acumulatedAmortization + amortization
newAcumulatedInterest = acumulatedInterest + interest
if newAmountToBePayed <= TOLERANCE:
newAmountToBePayed = Decimal('0.0')
amortizationPlan.setTableLine(index, payment, interest,
newAcumulatedInterest, amortization,
newAcumulatedAmortization,
newAmountToBePayed)
return amortizationPlan
def frenchAmortization(pv, i, n):
""" This method will implement the amortization based on the french system for PRICE payment """
if i == None or pv == None or n == None or i == Decimal(
"0") or pv == Decimal("0") or n == Decimal("0"):
raise PyFinancialLibraryException, "Some values for calculating amortization have not been provided."
realRate = i / Decimal('100.0')
#Getting pmt
pmt = calculateFrenchPmt(pv, realRate, n)
#Storing information for first period, containing for each period: pmt, interest, acumulated interest, amortization, acumulated amortization and amount to be payed
amortizationPlan = AmortizationTable(n)
amortizationPlan.setTableLine(0, Decimal('0.0'), Decimal('0.0'),
Decimal('0.0'), Decimal('0.0'),
Decimal('0.0'), pv)
#Calculating information for other periods
for index in xrange(1, n + 1, 1):
lastLine = index - 1
lastAmountToBePayed = amortizationPlan.getNewAmountToBePayed(lastLine)
acumulatedAmortization = amortizationPlan.getNewAcumulatedAmortization(
lastLine)
acumulatedInterest = amortizationPlan.getNewAcumulatedInterest(
lastLine)
amortization = (pmt - (pv * realRate)) * (realRate + 1)**(index - 1)
interest = pmt - amortization
amountToBePayed = lastAmountToBePayed - amortization
newAcumulatedAmortization = acumulatedAmortization + amortization
newAcumulatedInterest = acumulatedInterest + interest
if amountToBePayed <= TOLERANCE:
amountToBePayed = Decimal('0.0')
amortizationPlan.setTableLine(index, pmt, interest,
newAcumulatedInterest, amortization,
newAcumulatedAmortization,
amountToBePayed)
return amortizationPlan
