Double-A-92 · March 1, 2017 09:31
diff --git a/profit.py b/profit.py
 # - Global Constants -
 SALES_TAX = 35  # Tax paid when selling (in %)
 CURRENCY_UNIT = "USD"


 # - Input Handling Functions -
 def input_total_cost():
    """Asks the user how much he spent for the products in total"""

    total_cost_raw = input("How much did everything cost? ")
    total_cost = total_cost_raw.replace(',', '')  # Not quite sure what this is supposed to do
    return int(total_cost)  # Why do you want Integers? What about the cents?


 def input_number_of_items():
    """Asks the user how many items he bought"""

    number_of_items_raw = input("How many items do you have? ")
    number_of_items = number_of_items_raw.replace(',', '')  # Not quite sure what this is supposed to do
    return int(number_of_items)


 def input_item_sell_price():
    """Asks the user how much he can sell one item for"""

    item_sell_price_raw = input("How much does one item sell for? ")
    item_sell_price = item_sell_price_raw.replace(',', '')  # Not quite sure what this is supposed to do
    return int(item_sell_price)


 def is_input_valid(total_cost, number_of_items, item_sell_price):
    """Checks if the user inputs are valid"""
    # TODO: Split each check into new smaller functions if they get too big. Now it's just one if, so it's ok.

    input_valid = True

    # Check total cost
    # Nothing to check

    # Check number of items
    if number_of_items < 1:
        print("You have to buy at least one item!")
        input_valid = False

    # Check item sell price
    if item_sell_price <= 0:
        print("You can't sell your item for a negetive price!")
        input_valid = False

    # True if all checks passed
    return input_valid


 # - Business Logic Functions -
 def calculate_total_sell_price(number_of_items, item_price):
    """Calculates how much you could sell all your items for"""

    return number_of_items * item_price


 def calculate_total_sell_price_without_tax(number_of_items, item_price):
    """Calculates how much money you have after you subtract the tax"""

    price_with_tax = calculate_total_sell_price(number_of_items, item_price)
    remaining_ratio = (1.0 - SALES_TAX/100.0)
    price_without_tax = remaining_ratio * price_with_tax
    return price_without_tax


 def evaluate_profit(cost, revenue):
    """Evaluates if your investment would be profitable, and prints an according text"""

    profit = revenue - cost
    if not profit > 0:
        loss = -profit
        print("It's not worth it to make this investment. I would lose {0:,.2f} {1}".format(loss, CURRENCY_UNIT))
    else:
        print("I would make this investment, because I would earn {0:,.2f} {1}".format(profit, CURRENCY_UNIT))


 # - Main Function -
 def main():
    """The main program that is composed of all the small functions"""

    while True:  # Repeat the inputs until they are valid
        total_cost = input_total_cost()
        number_of_items = input_number_of_items()
        item_sell_price = input_item_sell_price()

        if not is_input_valid(total_cost, number_of_items, item_sell_price):
            print("Please retry.")
        else:
            break

    revenue = calculate_total_sell_price_without_tax(number_of_items, item_sell_price)
    evaluate_profit(total_cost, revenue)

 main()
	# - Global Constants -
	SALES_TAX = 35 # Tax paid when selling (in %)
	CURRENCY_UNIT = "USD"


	# - Input Handling Functions -
	def input_total_cost():
	"""Asks the user how much he spent for the products in total"""

	total_cost_raw = input("How much did everything cost? ")
	total_cost = total_cost_raw.replace(',', '') # Not quite sure what this is supposed to do
	return int(total_cost) # Why do you want Integers? What about the cents?


	def input_number_of_items():
	"""Asks the user how many items he bought"""

	number_of_items_raw = input("How many items do you have? ")
	number_of_items = number_of_items_raw.replace(',', '') # Not quite sure what this is supposed to do
	return int(number_of_items)


	def input_item_sell_price():
	"""Asks the user how much he can sell one item for"""

	item_sell_price_raw = input("How much does one item sell for? ")
	item_sell_price = item_sell_price_raw.replace(',', '') # Not quite sure what this is supposed to do
	return int(item_sell_price)


	def is_input_valid(total_cost, number_of_items, item_sell_price):
	"""Checks if the user inputs are valid"""
	# TODO: Split each check into new smaller functions if they get too big. Now it's just one if, so it's ok.

	input_valid = True

	# Check total cost
	# Nothing to check

	# Check number of items
	if number_of_items < 1:
	print("You have to buy at least one item!")
	input_valid = False

	# Check item sell price
	if item_sell_price <= 0:
	print("You can't sell your item for a negetive price!")
	input_valid = False

	# True if all checks passed
	return input_valid


	# - Business Logic Functions -
	def calculate_total_sell_price(number_of_items, item_price):
	"""Calculates how much you could sell all your items for"""

	return number_of_items * item_price


	def calculate_total_sell_price_without_tax(number_of_items, item_price):
	"""Calculates how much money you have after you subtract the tax"""

	price_with_tax = calculate_total_sell_price(number_of_items, item_price)
	remaining_ratio = (1.0 - SALES_TAX/100.0)
	price_without_tax = remaining_ratio * price_with_tax
	return price_without_tax


	def evaluate_profit(cost, revenue):
	"""Evaluates if your investment would be profitable, and prints an according text"""

	profit = revenue - cost
	if not profit > 0:
	loss = -profit
	print("It's not worth it to make this investment. I would lose {0:,.2f} {1}".format(loss, CURRENCY_UNIT))
	else:
	print("I would make this investment, because I would earn {0:,.2f} {1}".format(profit, CURRENCY_UNIT))


	# - Main Function -
	def main():
	"""The main program that is composed of all the small functions"""

	while True: # Repeat the inputs until they are valid
	total_cost = input_total_cost()
	number_of_items = input_number_of_items()
	item_sell_price = input_item_sell_price()

	if not is_input_valid(total_cost, number_of_items, item_sell_price):
	print("Please retry.")
	else:
	break

	revenue = calculate_total_sell_price_without_tax(number_of_items, item_sell_price)
	evaluate_profit(total_cost, revenue)

	main()