print ("Welcome! This program is going to help you calculate the self-cost of your car in the format of price per kilometre.")
forename = input("Let's get to know each other! My name is PythonProgram1, what's yours? ")
print ("Nice to meet you " + forename + ", let's get started!")
print ("")
print ("Easy stuff first, let's calculate the amortization of the vehicle.")

def sanitised_input(prompt, type_=None, min_=None, max_=None, range_=None):
    if min_ is not None and max_ is not None and max_ < min_:
        raise ValueError("min_ must be less than or equal to max_.")
    while True:
        ui = input(prompt)
        if type_ is not None:
            try:
                ui = type_(ui)
            except ValueError:
                print("Input type must be {0}.".format(type_.__name__))
                continue
        if max_ is not None and ui > max_:
            print("Input must be less than or equal to {0}.".format(max_))
        elif min_ is not None and ui < min_:
            print("Input must be greater than or equal to {0}.".format(min_))
        elif range_ is not None and ui not in range_:
            if isinstance(range_, range):
                template = "Input must be between {0.start} and {0.stop}."
                print(template.format(range_))
            else:
                template = "Input must be {0}."
                if len(range_) == 1:
                    print(template.format(*range_))
                else:
                    print(template.format(" or ".join((", ".join(map(str,
                                                                     range_[:-1])),
                                                       str(range_[-1])))))
        else:
            return ui

currentvalue = sanitised_input("Please enter the current value of your vehicle: ", float, 0)
period = sanitised_input("Please enter the usage time period in years: ", int, 1, 25)
remainingvalue = sanitised_input("Please enter the remaining value of your vehicle: ", float, 0, currentvalue)

ylostval = (currentvalue-remainingvalue)/period
mlostval = ((currentvalue-remainingvalue)/period)/12

print ("")
print ("That means our car is losing value of " + format(ylostval, '.2f') + " per year.")
print ("That's " + format(mlostval, '.2f') + " per month.")
print ("")
print ("Let's move on to some more in depth stuff.")
fuelconsumption = sanitised_input ("Please enter your car's fuel consumption (l/100km): ", float, 0)
fuelprice = sanitised_input("Please enter fuel price per litre: ", float, 0)
insurance = sanitised_input("Please enter the yearly insurance fee: ", float, 0)
inspectioncost = sanitised_input("Please enter the cost of technical inspection: ", float, 0)
inspectionint = sanitised_input("Please enter the interval of the technical inspection in years: ", int, 0, 5)
tiresprice = sanitised_input("Please enter the cost of tires: ", float, 0)
tiresdurability = sanitised_input("Please enter the durability of the tires in kilometres: ", int, 0)
lease = sanitised_input("Please enter the monthly lease payment (0 if none): ", float, 0)
maintenance = sanitised_input("Please enter the average cost of maintenance and repairs in a year: ", float, 0)
mileage = sanitised_input("Please enter the amount of kilometres you drive in a year: ", int, 0)

print ("")
print ("Thank you for baring with me " + forename + ". Now the calculations:")

costfuel = (fuelconsumption*fuelprice)/100
costtires = tiresprice/tiresdurability
costmaintenance = maintenance/mileage

costinspection = inspectioncost/inspectionint
costlease = lease*12
costinsurance = insurance
costyearly = insurance+costinspection+costlease
costmonthly = costyearly/12

costvariable = costfuel+costtires+costmaintenance

costfinal = costvariable+(costyearly/mileage)
costtotal = (costvariable*mileage)+costyearly

print ("Your yearly fixed costs are " + format(costyearly, '.2f') + ".")
print ("That equals to " + format(costmonthly, '.2f') + " per month.")
print ("Your variable costs are " + format(costvariable, '.2f') + " per kilometre.")
print ("What influences your self-price per kilometre the most is the amount of kilometres you drive.")
print ("At your yearly mileage of " + str(mileage) + " km, your final price per kilometre comes down to:")
print (format(costfinal, '.2f'))
print ("And your total costs per year are " + format(costtotal, '.2f') + ".")