Add 2020 Computer Science iGCSE Prerelease (India)

specimen-igcse-prereleases.py

@@ -1,4 +1,4 @@
-def prerelease_047802():
+def prerelease_047802_specimen():
     # define lists for all required data
     student_names = []
     test_1_marks = []
@@ -56,75 +56,150 @@ def prerelease_047802():
     # print average total for all students
     print("Average total: %.2f" % (sum / 30))
 
-def prerelease_047822():
+def prerelease_047822_india_2020():
+    # ask which base model user wants
     print("Which model?")
     print("(1) Hackback - Rs 5.35 Lakh")
     print("(2) Saloon - Rs 4.95 Lakh")
     print("(3) Estate - Rs 6.25 Lakh")
+    # keep asking until valid input is entered
     model = None
-    model = input()
     while not model:
+        # ask for choice
+        model = input()
+        # if input isn't a number, display error
         if (not model.isnumeric()):
-            model = input("Invalid input. Please enter a number between 1 and 3.")
+            model = print("Invalid input. Please enter a number between 1 and 3.")
             model = None
+        # if input is a number outside valid range, display error
         elif (int(model) < 1 or int(model) > 3):
-            model = input("Invalid input. Please enter a number between 1 and 3.")
+            model = print("Invalid input. Please enter a number between 1 and 3.")
             model = None
+    # get cost of chosen base model
     model_costs = [535000, 495000, 625000]
     cost = model_costs[int(model) - 1]
     
+    # ask which optional extras user wants
     print("Optional extras:")
     print("(1) Set of luxury seats - Rs 45000")
     print("(2) Satellite navigation - Rs 5500")
     print("(3) Parking sensors - Rs 10000")
     print("(4) Bluetooth connectivity - Rs 350")
     print("(5) Sound system - Rs 1000")
+    # ask for input, remove duplicated characters and remove non-numerical characters
     optional_extras = "".join(char for char in "".join(set(input("Please enter the numbers of the optional extras you would like. Invalid options will be ignored: "))) if char.isdigit())
+    # remove numbers outside of valid range
     optional_extras = "".join(char for char in optional_extras if 0 < char < 6)
 
+    # add costs of chosen optional extras to total cost
     optional_extra_costs = [45000, 5500, 1000, 350, 1000]
+    optional_extras_cost = 0
     for number in optional_extras:
         cost += optional_extra_costs[int(number) - 1]
+        optional_extras_cost += optional_extra_costs[int(number) - 1]
 
+    # ask if user is an existing customer
     existing_customer = input("Are you an existing customer (y/n)? ").lower()
+    # evaluate input to boolean
     existing_customer = True if (existing_customer[0] == "y" or existing_customer[-1] == "s") else False
     
+    # ask if user has car to trade in
     car_trade = input("Do you have a car to trade in (y/n)? ").lower()
+    # evaluate input to boolean
     if (car_trade[0] == "y" or car_trade[-1] == "s"):
         car_trade = True
+        # keep asking for trade-in amount until valid input entered
         trade_amount = None
         while (not trade_amount):
+            # ask for input
             trade_amount = input("How much have Snazzy Autos offered for your car (Rs)? ")
+            # if input isn't a number, display error
             if (not trade_amount.isnumeric()):
                 print("Invalid input. Please enter a number.")
                 trade_amount = None
+            # if input is a number outside of the acceptable range, display an error
             elif (trade_amount <= 0):
                 print("Invalid input. Please enter a number above 0.")
                 trade_amount = None
     else:
         car_trade = False
     
+    # display total cost without discounts
     print("Cost: Rs %.2f" % cost)
+    # calculate discount: 10% if existing customer and 5% if car isn't being traded in
     discount = (cost * 0.1 if existing_customer else 0) + (cost * 0.05 if not car_trade else 0)
+    # display total discount
     print("Discount: Rs %.2f" % discount)
+    # if car is traded in, print trade-in amount
     if car_trade: print("Trade-in amount: Rs %.2f" % trade_amount)
 
+    # print total cost
     print("\nTotal cost: Rs %.2f" % (cost - discount - trade_amount))
     
+    # ask which payment option user wants
     print("Which payment option would you like?")
-    print("(1) Pay full amount now - 1% \cashback - total cost Rs %.2f - one payment - including cashback of Rs %.2f" % (cost * 1.01, cost * 0.01))
+    cashback = cost * 0.01
+    if (cashback > optional_extras_cost):
+        print("(1) Pay full amount now - 1% \cashback - total cost Rs %.2f - one payment - including cashback of Rs %.2f | or free optional extras - total cost %.2f - one payment - including discount of %.2f" % (cost * 0.99, cashback, cost - optional_extras_cost, optional_extras_cost))
+    else:
+        print("(1) Pay full amount now - free optional extras - total cost %.2f - one payment - including discount of %.2f | or 1% \cashback - total cost Rs %.2f - one payment - including cashback of Rs %.2f" % (cost - optional_extras_cost, optional_extras_cost, cost * 0.99, cashback))
     print("(2) Monthly payements for four years - no charge - total cost Rs %.2f - payments of Rs %.2f - 48 payments" % (cost, cost / 48))
     print("(3) Monthly payments for seven years - 5% \charge - total cost Rs %.2f - payments of Rs %.2f - 80 payments" % (cost * 1.05, cost * 1.05 / 84))
+    # keep asking until valid input entered
     payment_option = None
     while (not payment_option):
+        # ask for input
         payment_option = input()
+        # if input isn't a number, display error
         if (not payment_option.isnumeric()):
             print("Invalid input. Please enter a number.")
             payment_option = None
+        # if input is a number outside acceptable range, display error
         elif (not 0 < int(payment_option) < 4):
             print("Invalid input. Please enter a number between 1 and 3.")
             payment_option = None
-    payment_option_costs = [-0.01, 0, 0.05]
+    # calculate total cost, adjusted for chosen payment option
-    cost = cost * payment_option_costs[int(payment_option - 1)]
+    if (payment_option == 3):
+        cost *= 1.05
 
-prerelease_047802()
+    # ask user if they want 1% cashback or free optional extras if they pay upfront
+    if (payment_option == 1):
+        print("Which option would you like?")
+        if (cashback > optional_extras_cost):
+            print("(1) Cashback - save Rs %.2f" % cashback)
+            print("(2) Free optional extras - save Rs %.2f" % optional_extras_cost)
+        else:
+            print("(1) Free optional extras - save Rs %.2f - total cost Rs %.2f" % (optional_extras_cost, cost - optional_extras_cost))
+            print("(2) Cashback - save Rs %.2f - total cost Rs %.2f" % (cashback, cost * 0.99))
+        # keep asking until valid input entered
+        cashback_or_free_extras = None
+        while (not cashback_or_free_extras):
+            cashback_or_free_extras = input()
+            # if input isn't a number, display error
+            if (not cashback_or_free_extras.isnumeric()):
+                print("Invalid input. Please enter a number.")
+                cashback_or_free_extras = None
+            # if input is number outside of acceptable range, display error
+            elif (not 0 < cashback_or_free_extras < 3):
+                print("Invalid input. Please enter either 1 or 2.")
+                cashback_or_free_extras = None
+        # calculate total cost and store order discount message
+        if ((cashback > optional_extras_cost and cashback_or_free_extras == 1) or (cashback <= optional_extras_cost and cashback_or_free_extras == 2)):
+            cost = cost * 0.99
+            order_message = "1% \cashback of Rs %.2f" % cashback
+        else:
+            cost = cost - optional_extras_cost
+            order_message = "free optional extras (Rs %.2f)" % optional_extras_cost
+    # store order discount message
+    if payment_option == 2:
+        order_message = "no discount"
+    elif payment_option == 3:
+        order_message = "5% price increase of Rs %.2f" % cost / 1.05 * 0.05
+    
+    # print order summary
+    print("\nOrder summary:")
+    print("Total cost: Rs %.2f - with %s" % (cost, order_message))
+    payments_number = [1, 48, 80]
+    print("%d payment(s) of Rs %.2f" % (payments_number[payment_option], cost / payments_number[payment_option]))
+
+prerelease_047802_specimen()