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item_56.py	https://github.com/AndyMeng/effectivepython/blob/master/example_code/item_56.py
item_56.py	https://github.com/AndyMeng/effectivepython/blob/master/example_code/item_56.py
item_58.py	https://github.com/AndyMeng/effectivepython/blob/master/example_code/item_58.py
item_58.py	https://github.com/AndyMeng/effectivepython/blob/master/example_code/item_58.py
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