Encapsulate Record

儲存資料的選擇上，作者建議用物件封裝可變資料，使用者就不用在乎裡面樣貌，更改相關名稱也能階段式完成；用記錄封裝不可變資料，像用hash、map、hashmap、dictionary 等。

在小範圍用這些記錄不太會有問題，但隨著被用範圍擴大，結構隱晦這缺點就值得封裝它們為資料類別（Data Class）。

# Before
employee = {
    "name": "John Doe",
    "age": 30,
    "department": "Finance"
}
print(f"Employee Name: {employee['name']}, Department: {employee['department']}")

# After
class Employee:
    def __init__(self, name, age, department):
        self.name = name
        self.age = age
        self.department = department

employee = Employee("John Doe", 30, "Finance")
print(f"Employee Name: {employee.name}, Department: {employee.department}")