Found the use of this mysterious bit of python code:
It is instructions to the interpreter to run this file as the main one. Because a project
can easily have more than one .py file in it, and one needs to check if it is one that is
imported or one doing the importing...
* * *
The underscore, in Python, is generally used to print the last output. It can
also bee used as a nameless variable.
By convention, coders use it to tell later users of some code to keep something private.
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