Example of data and non-data descriptors

data_descriptors.py

class NameDescriptor:
    """
    NameDescriptor is a data descriptor because it implements __get__ and one of either __set__ or __del__
    """

    def __init__(self, name='Any Name'):
        print(f"\n__init__ called on NameDescriptor.")
        self.name: str = name

    def __get__(self, instance, klass) -> str:
        print(f"\n__get__ called on NameDescriptor. Instance is {instance}. Class type is {klass}")
        return self.name

    def __set__(self, instance, name):
        print(f"\n__set__ called on NameDescriptor with value of {name}. Instance is {instance}.")
        if isinstance(name, str):
            self.name = name
        else:
            raise TypeError("Must pass in a string.")


class GradeDescriptor:
    """
    NameDescriptor is a non-data descriptor because it implements only a __get__ method
    """
    def __init__(self, grade: int = 10):
        print("\n__init__ called on GradeDescriptor.")
        self.grade = grade

    def __get__(self, instance, klass):
        print(f"\n__get__ called on GradeDescriptor. Instance is {instance}. Class type is {klass}")
        return self.grade