Why use os.path.join over string concatenation?

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Portable

Write filepath manipulations once and it works across many different platforms, for free. The delimiting character is abstracted away, making your job easier.

Smart

You no longer need to worry if that directory path had a trailing slash or not. os.path.join will add it if it needs to.

Clear

Using os.path.join makes it obvious to other people reading your code that you are working with filepaths. People can quickly scan through the code and discover it’s a filepath intrinsically. If you decide to construct it yourself, you will likely detract the reader from finding actual problems with your code: “Hmm, some string concats, a substitution. Is this a filepath or what? Gah! Why didn’t he use os.path.join?” 🙂

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