- https://stackoverflow.com/questions/31457855/cant-instantiate-abstract-class-with-abstract-methods
- https://stackoverflow.com/questions/8086826/cant-instantiate-abstract-class-with-abstract-methods-on-class-that-shouldn
- http://python.jobbole.com/81595/
- http://www.runoob.com/python/python-func-type.html
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