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Adding the Arduino repo as a git submodule can be very useful for version control. However, `git submodule update` is not enough, as the tools need to be downloaded through `get.py`. Wrapping the main code in that script into its own function allows an external Python script to import the module and execute its functionality without relying on the unsafe `execfile` (or `Popen`). The main advantage would be easy flow control in case of error (eg: issue #4464).