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And parents can have parents, creating a transitive subclass relation, conveniently accessible with the built-in function issubclass .
并且父亲还可以有父亲，创建一个传递的子类关系后，可以方便地利用内建的issubclass函数来判断继承关系。
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Forbes (no relation to the owners of this magazine) wanted to make modern classics more affordable and accessible for architects and design lovers.
FORBES: The Art Of Engagement
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