Finding a Python package or module can be as easy as entering the functionality you're looking for, like "mp3 tags" and "Python" into a search engine, and then sorting through the results. If you're lucky, you may find the module you need packaged for your OS—with an executable Windows or Mac OS X installer or a package for your Linux distribution.
This is one of the easiest ways to add a library to your Python installation, because the installer or your package manager takes care of all the details of adding the module to your system correctly.
In general, such prebuilt packages aren't the rule for Python software. Such packages tend to be a bit older, and there's less flexibility in where and how they're installed.
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