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item_54.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_54.py
item_55.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_55.py
item_55.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_55.py
item_56.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_56.py
item_56.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_56.py
item_58.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_58.py
item_58.py	https://github.com/qiqzhang/effectivepython/blob/master/example_code/item_58.py
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