SOLID Principles with Python | A story

To explore how to apply SOLID principles in practice, let's create a story.

The Beginning

Meet Mohammad, a smart person who wants to build a robust payment system.

First of all, Mohammad plans to create a class that has multiple responsibilities, such as adding items, calculating prices, creating a verification process, and accepting payments using different methods.

System initial code:

class Order:
    items = []
    quantities = []
    prices = []
    status = "open"

    def add_item(self, …

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