====== LU13.L02 - Hofladen erweitert======

===== Umsetzung  =====
==== 1. Anpassung Produkt ====

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<code python>
    @property
    def article_value(self):
        return self._price * self._stock
</code>
</WRAP>


==== 2. Funktion definieren ====

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<code python>
def handle_inventory(list):
    """
    prints the inventory and the total value
    :param list: the article list
    :return: None
    """
    sum = 0
    for article in list:
        sum = sum + article.article_value
        print(article.name + ' : ' + str(article.article_value))
    print('\nGesamt : ' + str(sum))
</code>
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==== 3. Programmfluss anpassen ====
 
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<code python>
if article_name == 'Inventory':
  handle_inventory(article_list)
  article_name = input('Artikelname > ')
  continue
else:
</code>
</WRAP> 

===== Gesamtlösung =====

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<file python article.py>
from dataclasses import dataclass


@dataclass
class Article:
    """
    an article in the farmshop
    """
    name: str
    price: float
    stock: int

    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, value):
        self._name = value

    @property
    def price(self):
        return self._price

    @price.setter
    def price(self, value):
        self._price = value

    @property
    def stock(self):
        return self._stock

    @stock.setter
    def stock(self, value):
        self._stock = value

    @property
    def article_value(self):
        return self._price * self._stock

if __name__ == '__main__':
    pass
</file>
</WRAP>

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<file python article.py>
from article import Article


def main():
    article_list = []
    article_name = input('Artikelname > ')
    while article_name != 'Exit':
        if article_name == 'Inventory':
            handle_inventory(article_list)
            article_name = input('Artikelname > ')
            continue
        else:
            article = find_article(article_list, article_name)

            if article is None:
                article = Article(article_name, 0.0, 0)
                article_list.append(article)
                article.price = input_float('Preis       > ')
            else:
                print('Bestand     : ' + str(article.stock))

            amount = input_float('Menge       > ')
            article.stock = (article.stock + amount)
            article_name = input('Artikelname > ')

    return article_list


def handle_inventory(list):
    """
    prints the inventory and the total value
    :param list: the article list
    :return: None
    """
    sum = 0
    for article in list:
        sum = sum + article.article_value
        print(article.name + ' : ' + str(article.article_value))
    print('Gesamt : ' + str(sum))


def input_int(prompt):
    """
    reads an integer input from the user
    :param text: the prompt to be shown
    :return: the integer number
    """
    number = None
    while number is None:
        try:
            number = int(input(prompt))
        except ValueError:
            print("Please, enter a whole number!")
            continue
    return number


def input_float(prompt):
    """
    reads a decimal number input from the user
    :param text: the prompt to be shown
    :return: the decimal number
    """
    number = None
    while number is None:
        try:
            number = float(input(prompt))
        except ValueError:
            print("Please, enter a real number!")
            continue
    return number


def find_article(list, name):
    """
    finds an article in the article list
    :param list: the article list
    :param name: the article name to be found
    :return: article or None=not found
    """
    for article in list:
        if article.name == name:
            return article
    return None


if __name__ == '__main__':
    main()

</file>
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