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Python 3
Python 3 introduced many useful features that are not backward compatible with Python 2.x. It also removed numerous Python 2.x features that were maintained for backward compatibility, making Python 3 easier to learn and use and more consistent with the rest of the language. Our experience using Python 3 in domains such as machine learning and web application development shows that both the language and most of its supporting libraries have matured for adoption. We were able to fork and patch minor issues of existing libraries or avoided using incompatible Python 2.x libraries that had been abandoned. If you are developing in Python we strongly encourage you to use Python 3.
Python 3 introduced many useful features that are not backward compatible with Python 2.x. It also removed numerous Python 2.x features that were maintained for backward compatibility, making Python 3 easier to learn and use and more consistent with the rest of the language. Our experience using Python 3 in domains such as machine learning and web application development shows that both the language and most of its supporting libraries have matured for adoption. We were able to fork and patch minor issues of existing libraries or avoided using incompatible Python 2.x libraries that had been abandoned. If you are developing in Python we strongly encourage you to use Python 3.