You may not always be in control of the Python version, for example if you depend on the Python provided by your OS. You may also want to use a newer Python ver

You may not always be in control of the Python version, for example if you depend on the Python provided by your OS. You may also want to use a newer Python version for its features, support (bugfixes) and libraries, so you'll need to rewrite things. Java also has versions, but they generally don't remove things. You can keep your ugly code and use the latest version of the language.